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Design of Li2 -Type Ni3 Si Intermetallics

Published online by Cambridge University Press:  28 February 2011

T. Takasugi  and
O. Izumi
T. Takasugi
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Japan
O. Izumi
Affiliation:
Professor Emeritus of Tohoku University, Japan
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Abstract

Based on the alloying method to improve the intergranular cohesion of LI2 alloys, it was shown that the Ni3 Si alloy was ductilized by the addition of Ti element and the control of stoicliometry. Metallographic and structural observations in the alloys along Ni3Si-Ni 3 Ti section were performed on optical microscopy, X-ray diffraction, TEM and ALCHEMI. It was shown that Ti element with a solubility of about 11 at.% substituted for the Si sites and the Ni3 (Si,Ti) alloys were highly ordered. The mechanical properties and fracture behavior of Ni3 (Si,Ti) polycrystals were investigated in terms of composition, the environmental effect, test temperature and the doping of B, C and Be. At ambient temperatures, higher ductility accompanied by a high portion of transgranular fractures was observed in the alloys with higher Ti and Ni contents, doped with B and C, and tested in vacuum. Hydrogen and oxygen from environment strongly affected the ductility and fracture of these alloys at ambient and elevated temperatures, respectively. The yield stress increased with increasing Ti content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 363
Copyright
Copyright © Materials Research Society 1991

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