| Transmission Electron Microscopy Study of Martensites in Laser-Clad Ni-Al Bronze on Aluminum Alloy AA333. |
1994 |
|
| Authors:
Y. Liu; J. Mazumder; K. Shibata; ILLINOIS UNIV AT URBANA DEPT OF MECHANICAL AND INDUSTRIAL ENGINEERING
|
 | The microstructure and crystal structure of laser-clad Ni-Al bronze on Al alloy AA333 were investigated with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with energy-dispersive X-ray spectroscopy (EDX). The SEM and TEM revealed two kinds of martensites in the clad region, sheet martensite and lath martensite. Selected area diffraction (SAD) analysis showed that the sheet martensite had a close-packed structure with different stacking modulations. Two crystal structure ... |
|
| Two-Dimensional Model for Laser-Induced Materials Damage: Effects of Assist Gas and Multiple Reflections Inside the Cavity. |
1992 |
|
| Authors:
A. Kar; T. Rockstroh; J. Mazumder; GENERAL ELECTRIC CO CINCINNATI OH AIRCRAFT ENGINE BUSINESS GROUP
|
| A two-dimensional axisymmetric model for materials removal during laser irradiation is developed by taking into account the reflections of the laser beam at the wall of the laser-induced cavity. The liquid metal flow at the interface of the assist gas and the liquid metal which is due to shear stress is also studied. The Stefan condition is applied at various points to obtain a model for the vaporization of the ... |
|
| Theoretical and Experimental Studies of Laser Chemical Vapour Deposition of Ti from TiBr4. |
MAY 1989 |
|
| Authors:
M. N. Azer; A. Kar; J. Mazumder
|
| Titanium metal has been deposited on a stainless steel substrate by decomposing TiBr4 with a 1.4 kW CW TEM00 CO2 laser. Both the film thickness and deposition rate of the films have been studied as a function of partial vapor pressure of TiBr4, irradiation time, beam diameter, laser power, and chamber temperature. The observed deposition rate (190 um/hr) was two orders of magnitude greater than deposition rate calculated for the ... |
|
| Three-Dimensional Transient Thermal Analysis for Laser Chemical Vapor Deposition on Uniformly Moving Finite Slabs. |
1989 |
|
| Authors:
A. Kar; J. Mazumder; ILLINOIS UNIV AT URBANA DEPT OF MECHANICAL AND INDUSTRIAL ENGINEERING
|
| This study presents a mathematical model for heat transfer in the substrate during laser chemical vapor deposition (LCVD). The results can be applied to the LCVD of pure titanium obtained from the thermal decomposition of titanium tetrabromide on stainless steel (S.S. 304), because the absorptivity of the substrate is determined from the optical properties of titanium tetrabromide, pure titanium, and S.S. 304. The transient and three-dimensional heat conduction equation is ... |
|
| Characterization of CW Laser-Gas and Laser-Metal Interactions. |
JUN 1986 |
|
| Authors:
T. J. Rockstroh; J. Mazumder
|
| The role of the plasma during laser materials interaction is studied using emission spectroscopy. The experiments were carried out in two stages: firstly, with a pure argon plasma and secondly with an aluminum target. The electron temperature distribution and electron density were determined. The experimental results were used to estimate laser attenuation and refraction as the beam propagates through the plasma column. Thus, transmitted energy and energy distribution on the ... |
|
| LASER PROCESSING OF MATERIALS; PROCEEDINGS OF A SYMPOSIUM HELD AT THE 113TH AIME ANNUAL MEETING, LOS ANGELES, CA, FEBRUARY 26 - MARCH 1, 1984 |
1985 |
|
| Authors:
K. MUKHERJEE; J. Mazumder
|
| EMPHASIS IS PLACED ON BOTH THE FUNDAMENTAL ASPECTS OF LASER-MATERIALS INTERACTION AS WELL AS PRACTICAL APPLICATIONS OF LASER AS A NEW TOOL IN MATERIALS PROCESSING. |
|
Reports by Author
