| In-Situ Observation of Deformation and Fracture Process for Metal Matrix Composites Under SEM and SAM |
93 |
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| Authors:
A. Kohyama; N. Niwa; S. Sato; TOKYO UNIV (JAPAN) DEPT OF METALLURGY AND MATERIALS SCIENCE*
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 | Using "in-situ" observation under a scanning electron microscope (sem) and scanning acoustic microscope (sam), deformation and fracture behavior of metal matrix composites was studied. the materials used were unidirectionally fiber reinforced sic(nicalon)/al and c(torayca)/al. indications about importance of fiber-matrix interface on crack initiation, arrest, and propagation were provided by in-situ observation of three point bending tests under sem. fatigue behavior was also studied under sem. in-situ observation under sam provided ... |
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| Effect of Neutron Irradiation on Impact Properties of Metal Matrix Composites |
93 |
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| Authors:
A. Kohyama; K. Hamada; S. Sato; TOKYO UNIV (JAPAN) DEPT OF METALLURGY AND MATERIALS SCIENCE*
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| This investigation deals with the effect of neutron irradiation on mechanical properties of unidirectionally reinforced metal matrix composites (mmcs). mmcs used were sic(nicalon) and c(torayca) reinforced al matrix composites. after neutron irradiation, tensile strength showed a large increase to certain fluences, and then changed to a decrease where the neutron fluence to the peak strength depends mainly on irradiation temperature. using a charpy impact tester, miniaturized charpy v-notch specimens were ... |
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| Effect of Helium Preinjection and Prior Thermomechanical Treatment on the Microstructure of Type 316 SS |
OCT 82 |
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| Authors:
A. Kohyama; G. Ayrault; A. P. L. Turner; N. Igata; ARGONNE NATIONAL LAB IL
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| Samples of 316 SS were preinjected with 15 appm helium either hot (650 C) or cold (room temperature) and irradiated with 3 MeV Ni(super +) ions to a dose level of 25 dpa at 625 C in order to test the validity of helium preinjection as a means of simulation of transmutant helium production. Results for preinjected and single-ion irradiated samples were compared to samples irradiated with 3 MeV Ni(super ... |
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| Influence of Helium-Injection Schedule and Prior Thermomechanical Treatment on the Microstructure of Type 316 SS |
OCT 82 |
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| Authors:
A. Kohyama; G. Ayrault; A. P. L. Turner; ARGONNE NATIONAL LAB IL
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| The influence of different helium-injection schedules on microstructure development in Ni(super +) ion irradiated 316 SS at 625 C is discussed. Injection schedules were chosen to approximate the MFR condition and mimic the mixed-spectrum reactor condition. Dual-ion irradiation to 25 dpa produced strongly bimodal cavity size distributions in solution-annealed and solution-annealed and aged samples, whereas single-ion irradiation followed by dual-ion irradiation to the same dose produced a cavity size distribution ... |
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| Surface Radiation Damage of Mo-TiC In-Situ Composites |
82 |
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| Authors:
N. Igata; A. Kohyama; TOKYO UNIV (JAPAN) DEPT OF METALLURGY AND MATERIALS SCIENCE*
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| In nuclear fusion material, Mo-TiC is thought to be probable candidate alloy because it has high temperature strength and is including low Z (low atomic number atoms) material at surface. Argon and helium irradiation were performed with the maximum energy of 400 KeV until 1.5 x 10 to the 22nd power ions/m(2). In argon irradiation due to differential sputtering between two phases and grooves at interphase interface, blister and flake ... |
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| Surface Radiation Damage in Mo-TiC Eutectic Composites |
81 |
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| Authors:
N. Igata; A. Kohyama
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| From the standpoint of plasma contamination, Low Z material coating on the first wall of Tokamak is thought to be very effective and one of the important problems is mechanical properties of coated materials and the interface to the substrate material. Therefore, in-situ composite materials of Low-Z and refractory metals are probable for the use but very few materials have been reported. The used Mo-TiC eutectoid with sub-micron fine structure ... |
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| THE EFFECT OF INTERFACE ON THE MECHANICAL BEHAVIORS OF MOLYBDENUM REINFORCED METAL COMPOSITES |
78 |
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| Authors:
N. Igata; A. Kohyama; TOKYO UNIV (JAPAN)
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| the objective of this study is to clarify the role of interface layers on the mixture rules of young's modulus, internal friction, tensile strength, ductility and strain rate sensitivity of strength using the three kinds of molybdenum reinforced metal composites. mo/cu was prepared by infiltration method. in the case of mo/ti and mo/ni, hot press method was used. |
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| DEVELOPMENT OF FERRITIC FILLER WIRE FOR AUTOMATIC MIG WELDING OF 9%NI STEEL |
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| Authors:
Y. Ito; M. Ikeda; M. Nakanisi; A. Kohyama; M. Nakakozi
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