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Tensile Properties of B2-Type CoTi Intermetallic Compound

Published online by Cambridge University Press:  21 March 2011

Y. Kaneno  and
T. Takasugi
Y. Kaneno
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1–1, Sakai, Osaka 599–8531, Japan
T. Takasugi
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, Gakuen-cho 1–1, Sakai, Osaka 599–8531, Japan
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Abstract

B2-type CoTi intermetallic compound that was hot-rolled and recrystallized was tensile-tested as functions of temperature and testing atmosphere. The tensile strength showed a peak at intermediate temperature (∼800K). The brittle-ductile transition (BDT) defined by tensile elongation took place at about 800K, above which large tensile elongation was observed. Corresponding to this transition, SEM fractography showed a change from cleavage-like pattern mixed with intergranular fracture pattern to large cross-sectional reduction, i.e. necking of the tensile specimen. Also, the observed mechanical properties were independent of heat-treatment procedures, indicating that retained vacancies did not affect the mechanical properties of CoTi intermetallic compound. However, the tensile elongation and UTS at room temperature were dependent on testing atmosphere, indicating that moisture-induced embrittlement occurred in CoTi intermetallic compound.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.27.1
Copyright
Copyright © Materials Research Society 2001

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