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The Ductility of Stoichiometric and Ni-Rich Polycrystals of Ni3Al: The Effect of Strain Rate

Published online by Cambridge University Press:  15 February 2011

E. M. Schulson  and
Y. Xu
E. M. Schulson
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
Y. Xu
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
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Abstract

Polycrystals of stoichiometric Ni3Ai are brittle in air at room temperature, at least at strain rates from 10-4 s-1 to 7 s-1. This is indicative of intrinsic brittle behavior. Nickel-rich (Ni24A1) polycrystals, on the other hand, undergo a brittle-to-ductile transition upon raising the strain rate to above about 10-2 s-1. It is argued that the transition reflects the suppression of environmental embrittlement, not of the intermetallic per se but of a Ni-rich solid solution that decorates the grain boundaries of the off-stoichiometric alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 425
Copyright
Copyright © Materials Research Society 1997

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