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Microstructures and Mechanical Properties in Ni3Si-Ni3Ti-Ni3Nb-Based Multi-Intermetallic Alloys

Published online by Cambridge University Press:  26 February 2011

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

Microstructure, high-temperature tensile deformation and oxidation property of Ni3Si-Ni3Ti-Ni3Nb multi-phase intermetallic alloys with a microstructure consisting of L12, D024 and D0 a phases were investigated. The tensile stress as well as the tensile elongation of these multi-phase alloys increased with increasing Si content, i.e. the volume fraction of L12 phase in the wide range of test temperatures. 50-ppm boron addition to these multi-phase intermetallic alloys resulted in increased tensile stress and tensile elongation. The multi-phase intermetallic alloy with a high Si content had good oxidation resistance, and also the boron addition to this alloy resulted in enhanced oxidation resistance. From an overall evaluation of the properties examined, it was shown that the multi-phase intermetallic alloy, which has a high Si content and is composed of L12 matrix dispersed by D024 and D0 a phases, had the most favorable properties as high-temperature mechanical and chemical materials.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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Microstructures and Mechanical Properties in Ni3Si-Ni3Ti-Ni3Nb-Based Multi-Intermetallic Alloys
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