METAL MATRIX COMPOSITES - Storming Media

Formation of Equiaxed Alpha and Titanium Nitride Precipitates in Spark Plasma Sintered TiB/Ti-6Al-4V Composites (Preprint)

Aug 2012

9 pages

Authors: P Nandwana; R Banerjee; J Y Hwang; M Y Koo; S H Hong; J Tiley; UNIVERSITY OF NORTH TEXAS DENTON DEPT OF MATERIALS SCIENCE AND ENGINEERING

The full text of this report is available for sale.

Spark plasma sintered TiB/Ti-6Al-4V composites have been characterized using scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). As-SPS processed composites exhibit a more refined distribution of equiaxed alpha precipitates as compared to arc-melted composites containing similar volume fraction of TiB precipitates. Additionally, SPS processed composites also show a highly refined distribution of TiN precipitates, as revealed by TEM studies.

Novel Metal-Matrix Composites With Integrally-Bound Nanoscale Carbon

Jun 2012

5 pages

Authors: David R Forrest; Iwona Jasiuk; Lloyd Brown; Peter Joyce; Azzam Mansour; Lourdes Salamanca-Riba; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD

We characterized the chemical, thermophysical, and mechanical properties of nanomaterials with up to 5 wt% nanocarbon (aka covetics) in aluminum and copper metals. The nanocarbon is detectable by EDS and XPS but not by analytical methods such as LECO and GDMS. Nanocarbon raises the melting point and significantly alters surface tension, and thus porosity, during solidification. Open questions remain about the observation of higher density than would be predicted by ...

A New Type of Carbon Nanostructure Formed Within a Metal-Matrix

Jun 2012

5 pages

Authors: Lourdes Salamanca-Riba; Romaine Isaacs; Azzam N Mansour; Adam Hall; David R Forrest; Melburne C LeMieux; Jason Shugart; MARYLAND UNIV COLLEGE PARK

Recent advances in nanomanufacturing have made it possible for large amounts ( 6 wt.%) of carbon to be incorporated as nanoscale carbon during a reaction process in molten aluminum, copper, silver, and other metals. These materials developed by Third Millennium Metals, LLC are called covetics. The carbon is highly stable despite its form not being predicted in phase diagrams, and remains dispersed after remelting and resolidification. The carbon incorporates into ...

Predicting Mechanical Properties of Metal Matrix Syntactic Foams Reinforced with Ceramic Spheres

Jan 2012

16 pages

Authors: J B Ferguson; J A Santa Maria; B F Schultz; P K Rohatgi; WISCONSIN UNIV-MILWAUKEE DEPT OF MATERIALS ENGINEERING

A model is presented that predicts peak stress, minimum stress, average stress, densification strain, and composite density in order to determine the energy absorption per unit volume and energy absorption per unit mass of metal matrix syntactic foams reinforced with hollow ceramic spheres subjected to unconstrained compression testing. Comparison of predictions to experimental data for Al-A206 and Al-A380 matrices of various heat treatments reinforced with Al2O3 spheres of various sizes, ...

Effect of Hollow Sphere Size and Distribution on the Quasi-Static and High Strain Rate Compressive Properties of Al-A380-Al2O3 Syntactic Foams

Jan 2012

23 pages

Authors: J A Santa Maria; B F Schultz; J B Ferguson; N Gupta; P K Rohatgi; WISCONSIN UNIV-MILWAUKEE DEPT OF MATERIALS ENGINEERING

Metal matrix syntactic foams are promising materials for energy absorption, however few studies have examined the effects of hollow sphere dimensions and foam microstructure on the quasi-static and high strain rate properties of the resulting foam. Aluminum alloy A380 syntactic foams containing Al2O3 hollow spheres sorted by size and size range were synthesized by a sub-atmospheric pressure infiltration technique. The resulting samples were tested in compression at strain rates ranging ...

Mechanical Behavior of Ultrafine-grained Al Composites Reinforced with B4C Nanoparticles

Jul 2011

5 pages

Authors: Zhihui Zhang; Troy Topping; Ying Li; Rustin Vogt; Yizhang Zhou; Chris Haines; Joseph Paras; Deepak Kapoor; Julie M Schoenung; Enrique J Lavernia; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ

The influence of nanoscale reinforcement on the mechanical behavior of ultrafine-grained composites was studied. Al 5083 (Al-4.5 Mg-0.57Mn-0.25Fe) composites, with grain size of 115 nm and B4C reinforcement size of 38 nm, were fabricated via cryomilling and consolidation. The result reveals that the presence of nanoparticles enhances strength by interacting with dislocations, while simultaneously retarding grain growth. Furthermore, the nanoparticles-reinforced composite exhibits enhanced plasticity relative to the same material reinforced ...

Size-Dependent Strengthening Of Particle-Reinforced Aluminum Matrix Composites

May 2011

24 pages

Authors: Cyril L Williams; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE

The finite-element-based microstructural modeling technique developed by Suh et al. (Suh, Y. S.; Joshi, S. P.; Ramesh, K. T. Acta. Mater. 2009, 57, 5848) was reviewed and used for studying the different responses between isotropic and anisotropic aluminum matrix with varying particle sizes. The results show that the overall response of the material was identical when the matrix material was changed from isotropic-elastic/plastic aluminum to anisotropic-elastic/isotropic-plastic aluminum, especially for the ...

Development of a Blast Event Simulation Process for Multi-Scale Modeling of Composite Armor for Light Weight Vehicles (PREPRINT)

15 MAR 2011

24 pages

Authors: John P. Kim; Nicholas Vlahopoulos; Geng Zhang; MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING

This paper presents the development of a multi-scale simulation process for modeling the response of a vehicle with composite armor to the blast loads from an explosive threat. The new process can be used for improving the blast resistant capabilities of the composite armor by configuring its properties at the micro-level. A Blast Event Simulation system (BEST) that facilitates the easy use of LS-DYNA or ABAQUS for conducting a complete ...

Role of Friction on the Thermal Development in Ultrasonically Consolidated Aluminum Foils and Composites

2011

15 pages

Authors: Steve Koellhoffer; Jr Gillespie John W.; Suresh G. Advani; Travis A. Bogetti; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Ultrasonic consolidation is a solid-state bonding process capable of producing metal and metal matrix composite parts. In this work a friction-based heat generation model is proposed to characterize the thermal development of ultrasonically consolidated aluminum foils and continuous fiber alumina reinforced aluminum metal matrix composite tape as a function of process control parameters. The friction coefficient between mating surfaces is determined experimentally, and the credibility of using both a constant ...

Modeling Effects of Crystalline Microstructure, Energy Storage Mechanisms, and Residual Volume Changes on Penetration Resistance of Precipitate-Hardened Aluminum Alloys

Aug-2009

14 pages

Authors: John D Clayton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

An anisotropic nonlinear crystal mechanics model is developed for a class of ductile aluminum alloys, with the intent of relating microscopic features and properties to performance of the alloys deformed at high strain rates that may arise during impact and blast events. A direct numerical simulation of dynamic tensile deformation of an aluminum polycrystal demonstrates a tendency for shear localization to occur in regions of the microstructure where the ratio ...

Characterization of Corrosion on Outdoor-Exposed Aluminum Metal-Matrix Composites as a Function of Reinforcement Specie and Volume Fraction

FEB 2008

52 pages

Authors: Ralph P. Adler; Daniel J. Snoha; George Hawthorn; Lloyd H. Hihara; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE

The Hawaii Corrosion Laboratory and the U.S. Army Research Laboratory collaborated to prepare, environmentally expose for up to 2 years, and evaluate multivariant sets of metal matrix composites (MMCs). The experimental matrix involved variations in particulate volume-percent and particulate reinforcement specie (higher purity green and less-pure black silicon carbide, boron carbide, and alumina). The specific objective of this study was to determine, mainly using x-ray powder diffractometry, how observed gravimetric ...

Multiscale Modeling of Particle-Solidification Front Dynamics, Part 3: Theoretical Aspects and Parametric Study (Preprint)

SEP 2007

27 pages

Authors: Justin W. Garvin; Yi Yang; H. S. Udaykumar; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE

The development of the solidified microstructure in metal-matrix composites depends on complex interactions between non-planar solidification fronts and multiple particles. The problem is multiscale in nature; the motion of the particle (under the action of a nano-scale disjoining pressure force and a micro-scale viscous drag force) is dynamically coupled with the developing solidification front morphology, which is dependent on a variety of thermal conditions. Using computational techniques discussed in parts ...

Genetic Algorithm Optimization of Phononic Bandgap Structures

SEP 2006

28 pages

Authors: George A. Gazonas; Daniel S. Weile; Raymond Wildman; Anuraag Mohan; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE

This report describes the use of genetic algorithms (GAs) for the optimal design of phononic bandgaps in periodic elastic two phase media. In particular, we link a GA with a computational finite element method for solving the acoustic wave equation, and find optimal designs for both metal-matrix composite systems consisting of Ti/SiC, and H2O-filled porous ceramic media, by maximizing the relative acoustic bandgap for these media. The term acoustic here ...

Collaborative Research Program on Advanced Metals and Ceramics for Armor and Anti-Armor Applications Dynamic Behavior of Non-Crystalline and Crystalline Metallic Systems

SEP 2006

36 pages

Authors: K. T. Ramesh; James W. McCauley; JOHNS HOPKINS UNIV BALTIMORE MD

This collaborative research program emphasized collaborative research between Johns Hopkins University and the U.S. Army Research Laboratory (ARL) towards well-defined common goals: the understanding and development of advanced metallic systems for armor and anti-armor applications. The Johns Hopkins side of the collaboration was operated through a science driven, problem-directed Center the Center for Advanced Metal and Ceramic Systems. The Center provides a tight integration of the University with ARL, providing ...

Ti-Based Metal Matrix Composites Reinforced with TiB Particles

16 MAY 2006

77 pages

Authors: Orest M. Ivasyshyn; AKADEMIYA NAUK URSR KIEV INST OF PHYSICS OF METALS

This report results from a contract tasking Institute for Metal Physics as follows: Reinforcement of a titanium matrix by TiB particles leads to increased tensile strength, creep resistance, Young's modulus, hardness and wear resistance of the composite material. This study will develop a scientific background of processing Ti/TiB in-situ composite material through ingot melting followed by hot working and heat treatment. The aim of the present study is to establish ...

Structural Piezoelectric Single Crystal Array Networks (Structural P-SCAN)

MAR 2006

7 pages

Authors: S. L. Kampe; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF MATERIALS SCIENCE AND ENGINEERING

Experimental verification of enhanced passive mechanical damping as derived from ferroelectric-embedded particulates within a metal matrix composite has been demonstrated. Specifically, experimental results indicate relatively high damping is exhibited by composites containing a discontinuous dispersion of ferroelectric (tetragonal) BaTiO(sub 3) particulate; damping capability is reduced as temperature increases and a transformation to a cubic form occurs. Experiments performed at the Los Alamos Neutron Science Center (LANSCe) indicate that the mechanism ...

An Experimental Approach for Studying the Creep Behavior of Thin Film/ Substrate Interfaces

SEP 2004

59 pages

Authors: Carl L. Parks; NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Large shear stresses often develop at the interface between dissimilar materials in microelectronic devices, when they are subjected to thermo-mechanical excursions. These stresses, which typically occur due to thermal expansion mismatch between the adjoining materials, are usually confined near the edges of films. However, for narrow thin film lines, these stresses may exist over a large fraction of the film-substrate interface. When the substrate is subjected to relatively high homologous ...

Lightweight, High-Strength, Age-Hardenable Nanoscale Materials

25 MAR 2004

28 pages

Authors: Vijay K. Vasudevan; Jainagesh A. Sekhar; CINCINNATI UNIV OH DEPT OF CHEMICAL AND MATERIALS ENGINEERING

Phase transformations and precipitation behavior in age-hardenable nanoscale materials, using binary aluminum alloys as model materials, were studied. Nanoparticles of Al-Cu and Al-Zn were synthesized by a plasma ablation process. The particles (50-100 nm dia) were found to be supersaturated f.c.c. and were enveloped by a 2-4 nm amorphous Al oxide layer. On aging the Al-Cu nanoparticles, a precipitation sequence comprising nearly pure Cu precipitates to theta' to the equilibrium ...

Opportunities and Approaches for Doubling the Structural Efficiency of Metallic Materials

09 SEP 2003

63 pages

Authors: Daniel B. Miracle; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE

Briefing charts of presentation on the opportunities and approaches for doubling the structural efficiency of metallic materials.

Creep Behaviour and Strength of Magnesium-Based Composites

SEP 2003

27 pages

Authors: V. Sklenicka; M. Pahutova; K. Kucharova; M. Svoboda; CZECHOSLOVAK ACADEMY OF SCIENCES BRNO INST OF PHYSICAL METALLURGY

Briefing charts on presentation of the creep behavior and strength of magnesium-based composites.

Metallic Composites. Work Unit Directive (WUD) 56

JAN 2002

12 pages

Authors: Daniel B. Miracle; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE

Proceedings of the Japan International SAMPE Symposium (7th) on Information and Innovation in Composites Technologies Held in Tokyo, Japan on November 13-16, 2001

16 NOV 2001

1008 pages

Authors: T. Ishikawa; S. Sugimoto; NIHON UNIV TOKYO

The 7th Japan International SAMPE Symposium was held on 13-16 Nov 01 in Tokyo, Japan. 232 papers are included in the proceedings. The conference consisted of 5 satellite workshops and 10 sessions. Satellite workshops included: A. Smart structures and materials/eco-materials, B. Design and Manufacturing of revolutionary light weight aircraft structures, C. Development of low cost composite structures, D. New materials in space vehicles, and E. Composite applications to infrastructure. Sessions ...

6TH National Congress of Mechanics. Book of Abstracts

21 JUL 2001

Authors: E. C. Aifantis; A. N. Kounadis; ARISTOTLE UNIV OF THESSALONIKI (GREECE) HELLENIC SOCIETY OF THEORETICAL AND APPLIED MECHANICS

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

It was an honor that HSTAM (Hellenic Society of Theoretical and Applied Mechanics) assigned to the Laboratory of Mechanics of the General Department of AUT the responsibility of organizing the 6th National Congress of Mechanics in cooperation with the Department of Civil Engineering of AUT. The abstracts of this meeting are presented.

6TH National Congress of Mechanics. Proceedings, Volume I

21 JUL 2001

Authors: E. C. Aifantis; A. N. Kounadis; ARISTOTLE UNIV OF THESSALONIKI (GREECE) HELLENIC SOCIETY OF THEORETICAL AND APPLIED MECHANICS

Special Issue: Processing of Fibers and Composites. Composites Part A: Applied Science and Manufacturing. Volume 32A 2001. Conference Held in Barga, Tuscany, Italy on May 21-26, 2000

2001

199 pages

Authors: K. K. Chawla; A. Mortensen; J. Manson; UNITED ENGINEERING FOUNDATION CONFERENCES NEW YORK

Proceedings of The Second Asian-Australasian Conference on Composite Materials (ACCM-2000) Composites Technologies for the New Millennium, Volume 1, Held in Kyongju, Korea, on 18-20 Aug 2000

AUG 2000

668 pages

Authors: Chang-Sun Hong; Chun-Gon Kim; KOREA ADVANCED INST OF SCIENCE AND TECHNOLOGY TAEJON DEPT OF MATERIALS SCIENCE AND ENGINEERING

There has been active discussion about the formation of the so-called "Asian-Australasian Association for Composite Materials (AACM)" as an equivalent ICCM in the Asian-Australasian region. The AACM was established after active discussion during ICCM-11 meeting in Gold Coast. The objective of the AACM is to encourage the free interchange of information on all aspects related to composite materials, which are of interest to the scientific and engineering ...

Transformation Superplasticity of Intermetallic and Ceramic Matrix Composites

14 JUL 2000

Authors: David C. Dunand; MASSACHUSETTS INST OF TECH CAMBRIDGE

Transformation superplasticity - defined as the capability of allotropic materials to deform rapidly and without fracture upon thermal cycling between their two phases - has been studied in a series of monolithic and composite materials systems: metals (Fe, Ti and Zr), metal matrix composites (Ti6Al4V-TiC, Ti6Al4V-TiB and Fe-TiC), intermetallic matrix composites (NiAl- ZrO2), ceramics (Bi2O3) and ceramic matrix composites (zirconia-based system). Often, samples were fabricated ...

Modeling of Strength and Toughness of Ceramic Matrix Composites Based onDiscrete Fiber Distribution

MAY 2000

8 pages

Authors: Asher Rubinstein; TULANE UNIV NEW ORLEANS LA DEPT OF MECHANICAL ENGINEERING

The prime objective of the project was development of a practically reliable model that would help to understand the process taking place and the mechanics of failure development in ceramic matrix composites. During the course of the project, we developed a micromechanical model which could address a variety of aspects of the composite behavior on macroscale. The model uses the mechanical properties of composite components, interfaces, ...

Fatigue of Bet Titanium Alloys

MAR 2000

74 pages

Authors: K. S. Ravichandran; UTAH UNIV SALT LAKE CITY DEPT OF METALLURGICAL ENGINEERING

A comprehensive investigation of the nature of fatigue in beta titanium alloys, especially in Ti-10V-3Fe-3Al alloy, emphasizing the crack initiation and crack growth aspects in controlled microstructural conditions, was performed. A detailed survey of literature of past work in this area, was also conducted. It has been found that the fatigue limit in this alloy is independent of the size, shape and volume fraction of ...

International Conference on Composite Structures (10th) (ICCS/10) Held in Melbourne, Australia, 15-17 November 1999. Volume 47, Numbers 1-4

DEC 1999

Authors: I. H. Marshall; R. Jones; MONASH UNIV CLAYTON (AUSTRALIA) DEPT OF MECHANICAL ENGINEERING

This conference forms a natural extension from the previous ten International Conferences on Composite Structures (ICCS/1-10) held biennially since 1981. It is one of the longest running conferences on composites worldwide and continues to be the prime focus for structural aspects of composites. A wide spectrum of aspects of composite structures are addressed, ranging from precision fabrication techniques used in the space shuttle program to natural fiber composites used as ...

International Conference "Advanced Materials Symposium A: Engineering ofComposites: Investigation, Technologies, and Perspectives. Abstracts

08 OCT 1999

373 pages

Authors: UKRAINIAN ACADEMY OF SCIENCES KIEV INST OF MATERIALS SCIENCE PROBLEMS

The Final Proceedings for International Conference, 3 October 1999 - 7 October 1999. This is an interdisciplinary conference. Topics include: Mathematical and Computer Simulation, Interface Interaction, Adhesion and Interconnection, Behavior under Mechanical Loading, Composites with the Ceramic Matrix, Composites with the Metallic Matrix, Composites with the Carbon Matrix, Composites with the Polymer Matrix, Powder Metallurgy, (10) Functionally Graded Materials, Nanocomposites, Smart Composites Testing, Industrial ...

Orthorhombic Titanium Aluminide Metal Matrix Composites (O TMCs) - A review

OCT 1999

Authors: P. R. Smith; A. H. Rosenberger; C. G. Rhodes; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE

Continuous silicon carbide (SiC) reinforced titanium matrix composites (TMCs) utilizing matrices based upon the intermetallic orthorhombic (O) phase, Ti2AlNb, have been the subject of a significant development activity over the past several years. These O TMCs are considered enabling materials for rotating engine components in order to meet the requisite increased thrust/ weight ratios and decreased specific fuel consumption targets for the next generation ...

Mechanical Behavior of Advanced Aerospace Materials

SEP 1999

246 pages

Authors: N. E. Ashbaugh; D. J. Buchanan; A. L. Hutson; R. John; K. Li; DAYTON UNIV OH STRUCTURAL INTEGRITY DIV

This report summarizes investigations involving the characterization of second tier mechanical properties of current and advanced aerospace materials and the development of damage tolerant design approaches and durability analyses for the applications of these materials. Specifically, studies of gamma-titanium aluminides have dealt with the identification and origins of defects that are associated with processing procedures and with the role of defects and grain orientation on fatigue crack ...

Characterization of Materials Degradation due to Corrosion and Fatigue in Aerospace Structures

13 MAY 1999

17 pages

Authors: A. K. Mai; J. M. Yang; K. Ono; CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIEDSCIENCE

Research was carried out in two related areas: (1) the degradation inthe load carrying capacity of the structural components, and (2) nondestructive evaluation (NDE) for characterization of the degradation. In the first topic, the effect of pitting corrosion on the strength of aircraft grade aluminum alloys was studied through laboratory tensile and fatigue tests and theoretical modeling. The probability of failure in the presence of multiple pits was found to ...

Intelligent Processing of High Performance Materials (le Traitement sophistique de materiaux tres performants)

NOV 1998

Authors: NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)

Contains the papers presented at a Workshop on Intelligent Processing of High Performance Materials organized by the Applied Vehicle Technology Panel (AVT) of RTO, in Brussels, Belgium, 13-14 May 1998. The papers describe various aspects of intelligent processing, a methodology for simulating and controlling the processing and manufacture of materials, which is finding widespread application during the manufacture of functional electronic, photonic and composite materials as well as primary metals ...

FIDEP2 User Manual to Micromechanical Models for Thermoviscoplastic Behavior of Metal Matrix Composites

SEP 1998

246 pages

Authors: Demirkan Coker; Frank Boller; Joseph Kroupa; Noel E. Ashbaugh; DAYTON UNIV OH RESEARCH INST

The FIDEP2 (Finite-Difference code for Elastic-viscoplastic analysis) is a PC-compatible, user-friendly computer code developed in-house at the Materials Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio. The program is capable of predicting micromechanical stresses in metal matrix composites under complex thermal and mechanical loading histories. The FIDEP2 is a generalized version of the FIDEP program, which was limited by the concentric cylindrical geometry and elastic-plastic constitutive model. The FIDEP2 program ...

2ND International Conference on Composite Science and Technology

04 AUG 1998

Authors: S. Adall; E. V. Morozov; V. E. Verijenko; NATAL UNIV DURBAN (SOUTH AFRICA) DEPT OF MECHANICAL ENGINEERING

In recent years there have been remarkable developments and advances in the field of composites involving all majors aspects, namely materials, structures and manufacturing. The new techniques have been developed as a result of extensive experimental, computational and analytical studies, adding a new dimension to tailor-made materials which are suitable not only for applications involving aerospace but also civilian structures. As research papers presented at ...

Bulk Metallic Glass Matrix Composites

AUG 1998

16 pages

Authors: William L. Johnson; William A. Goddard III; CALIFORNIA INST OF TECH PASADENA

Bulk metallic glass (BMG) forming alloys were used to synthesis metal matrix composites with the BMG as the matrix. The second phase in the composite is a refractory ceramic material (e.g. tungsten-carbide) or a heavy ductile metal (e.g. tungsten and tantalum). Composites containing up to 80% reinforcement were fabricated and characterized with respect to mechanical properties. Dynamic deformation behavior of BMG/tungsten composites was studied at ballistic impact velocities. The 13 ...

Spray Deposition Processing of Al/SiC MMC Armor Materials and Ta Alloys for Army Applications

JUN 1998

176 pages

Authors: E. J. Lavernia; F. A. Mohamed; CALIFORNIA UNIV IRVINE DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE

In this research program, the spray atomization and deposition technique was both experimentally and numerically studied to process ceramic particulate reinforced (including functionally graded reinforcement distributions) A1 alloy metal matrix composites (MMCs) as armor materials and Ta alloys for Army applications such as shaped charged liners and explosively formed projectiles. In this final progress report, the aforementioned experimental and numerical results are described and discussed in five individual sections, which ...

Proceedings Second International Conference on Composite Science and Technology 9 - 11 June 1998 Durban South Africa

JUN 1998

570 pages

Authors: S. Adall; E. V. Morozov; V. E. Verijenko; NATAL UNIV DURBAN (SOUTH AFRICA) DEPT OF MECHANICAL ENGINEERING

The design and development of supersonic/hypersonic flight vehicles, of Future reusable space transportation systems, launch vehicles and of advanced propulsion systems constitute challanging issues for the aeronautical engineers and the research workers insolved in these problems. It is a well-known fact that during their flight missions, the structure of flight vehicles has to with stand severe aerodynamic, aeroacoustic and thermomechanical loads. The temperatures involved are ...

High Temperature Composites: Properties, Processing and Performance

21 MAY 1998

219 pages

Authors: Carl T. Herakovich; Jacob Aboudi; Dana M. Elzey; Roland H. Krauss; Marek-Jerzy Pindera; VIRGINIA UNIV CHARLOTTESVILLE SCHOOL OF ENGINEERING AND APPLIED SCIENCE

The results of the five year grant (including one year of no-cost extension) are reported. The main accomplishments of the grant activity were fabrication, modeling and testing of a hybrid ceramic fiber and nickel alloy matrix composites suitable for higher temperature applications at lower cost.

Materials Research Center for Excellence

15 JAN 1998

40 pages

Authors: James Wagner; JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MATERIALS SCIENCE AND ENGINEERING

This report details results from a program supported through the ARO to establish technical collaborative links between investigators at the Johns Hopkins University and their technical counterparts at the Army Research Laboratories/Materials Directorate. With technical program guidance primarily from Dr. James McCauley, eight research tasks were pursued. For each task an investigator at the ARL Materials Directorate provided guidance and, in many cases, close collaboration toward achieving the research task ...

Fabrication and Microstructure of Metal-Metal Syntactic Foams

1998

5 pages

Authors: J. H. Nadler; K. M. Hurysz; J. L. Clark; J. K. Cochran; K. J. Lee; GEORGIA INST OF TECH ATLANTA SCHOOL OFMATERIALS SCIENCE AND ENGINEERING

The objective of this paper is to report on the fabrication process and document the microstructure of metal-metal syntactic foams. The composite microstructure consists of thin-wall, hollow Fe-Cr stainless steel spheres cast in various metal matrices including aluminum alloys 6061, 7075, 413, magnesium alloy AZ31B, and unalloyed aluminum and magnesium. Hollow spheres were formed from slurries of fine particle size iron and chromium oxides via the coaxial nozzle process. The ...

Mechanism-Based Design for High-Temperature, High-Performance Composites. Book 2

SEP 1997

302 pages

Authors: Anthony G. Evans; Frederick A. Leckie; J. W. Hutchinson; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS

The Final Report of the University Research Initiative project at UCSB on Mechanism-Based Design for High Temperature, High Performance Composites consists of four books. The books are entitled as follows: 1-Constituent Properties and Macroscopic Performance of CMC - I; 2-Constituent Properties and Macroscopic Performance of CMC - II; 3A-Constituent Properties and Macroscopic Performance of MMC, 3B-Constitutive Laws and Design; 4-Measurement and Micro- Mechanisms

Mechanism-Based Design for High-Temperature, High-Performance Composites. Book 1

SEP 1997

252 pages

Authors: Anthony G. Evans; Frederick A. Leckie; J. W. Hutchinson; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS

Mechanism-Based Design for High-Temperature, High-Performance Composites. Book 4

SEP 1997

324 pages

Authors: Anthony G. Evans; Frederick A. Leckie; J. W. Hutchinson; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS

Mechanism-Based Design for High-Temperature, High-Performance Composites. Book 3

SEP 1997

438 pages

Authors: Anthony G. Evans; Frederick A. Leckie; J. W. Hutchinson; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS

The Micromechanics of High Strain-Rate Deformation and Failure of Dual- Phase Composites

27 JUN 1997

7 pages

Authors: G. Bao; JOHNS HOPKINS UNIV BALTIMORE MD

Under the support of ARO (Grant number: DAAH04-94-G-0086, Solid Mechanics Program, Program Director, Dr. K. Iyer), a three-year basic research program is carried out on the micromechanics of high strain-rate deformation and failure in dual-phase composites. Three composite material systems are studied: (1) tungsten heavy alloys and tungsten-based composites; (2) ceramic particle reinforced metal matrix composites; and (3) penetrator/armor material combinations. Emphasis is placed on the relationship between the microstructure ...

Materials Processing and Microstructure Control in High Temperature Ordered Intermetallics

16 JUN 1997

74 pages

Authors: J. H. Perepezko; WISCONSIN UNIV-MADISON DEPT OF MATERIALS SCIENCE AND ENGINEERING

In the development of high temperature intermetallic systems for structural applications a crucial issue is the formulation of materials processing strategies in order to achieve controlled microstructures that are designed to provide for the required mechanical performance. In the current research an integrated approach that couples processing with microstructure control as guided by the operative phase equilibria has been used to identify several promising intermetallic alloys. The experimental efforts have ...

Ceramic/Metal Composite Circuit-Board Level Technology for Application Specific Electronic Modules (ASEMs)

JUN 97

15 pages

Authors: B. J. Thaler; DAVID SARNOFF RESEARCH CENTER PRINCETON NJ

The quarterly progress for the Ceramic/Metal Composite Circuit-Board- Level Technology for Application Specific Electronic Modules is described in this report. Data is reported for the following tasks: Technology Transfer to Merchant Suppliers, and Fabrication and Testing of Technology Demonstration Modules.