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Microstructure and Mechanical Properties of B2 (Co,Ni)Al Based Allots

Published online by Cambridge University Press:  01 January 1992

Yoshisato Kimura ,
Tomoo Suzuki  and
Yoshinao Mishima
Yoshisato Kimura
Affiliation:
Graduate Student, Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Tomoo Suzuki
Affiliation:
Department of Metallurgical Engineering, Tokyo Institute of Technology, 0-okayama Tokyo 152, Japan
Yoshinao Mishima
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta, Midorl-ku, Yokohama 227, Japan
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Abstract

Two-phase alloys based on B2 type intermetallic compound (Co,Ni)Al with either Co primary solid solution or Li2 type Ni3Al, γ, phase are investigated for their variations in microstructure and mechanical properties. The aim of the present work is to improve ductility and to enhance fracture resistance in extremely brittle B2 CoAl or NiAl by introducing second phase. To start with, microstructure-mechanical property relationship is investigated in two-phase alloys consisting of B2 CoAl and Co primary solid solution in the Co-Al binary system. Subsequently, the similar strategy is extended into the Co-Ni-Al ternary system. Mechanical properties are measured by compression test conducted over the wide temperature range from 77 K to 1273 K at strain rates ranging from 1.4xl0-3 to 1.4-4 s-1. Micro-structure observations are carried out using both optical and transmission electron microscope.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 697
Copyright
Copyright © Materials Research Society 1995

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References

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