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The Effect of Boron on Microhardness in Ni3 Al Polycrystals

Published online by Cambridge University Press:  26 February 2011

X. R. Qian  and
Y. T. Chou
X. R. Qian
Affiliation:
Department of Materials Science and Engineering and Materials Research Center Lehigh University Bethlehem, PA 18015 U.S.A.
Y. T. Chou
Affiliation:
Department of Materials Science and Engineering and Materials Research Center Lehigh University Bethlehem, PA 18015 U.S.A.
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Abstract

In a recent MRS symposium, the effect of boron on grain boundary hardness (GBH) in Ni3Al was reported. Addition of 0.2 at.% of boron decreased the GBH in all three sets of alloys tested (24, 25, and 26 at.% Al). The present paper summarizes the study of the effect of boron on hardness within grains. Boron-induced softening was again observed in grain interiors. However, it occurred only in alloys with 24 and 25 at.% Al, but not in the alloy with 26 at.% Al. An explanation for this behavior is presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 529
Copyright
Copyright © Materials Research Society 1989

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References

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