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Assessment of the Compositional Influences on the Toughness of TiCr2-Base Laves Phase Alloys

Published online by Cambridge University Press:  15 February 2011

Katherine C. Chen ,
Samuel M. Allen  and
James D. Livingston
Katherine C. Chen
Affiliation:
Massachusetts Institute of Technology, Dept. of Mat. Sci. and Eng., Cambridge, MA 02139
Samuel M. Allen
Affiliation:
Massachusetts Institute of Technology, Dept. of Mat. Sci. and Eng., Cambridge, MA 02139
James D. Livingston
Affiliation:
Massachusetts Institute of Technology, Dept. of Mat. Sci. and Eng., Cambridge, MA 02139
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Abstract

Systematic studies of alloys based on TiCr2 have been performed in order to improve the toughness of Laves phase intermetallics. The extent to which alloy compositions and annealing treatments influence the toughness was quantified by Vickers indentation. The single-phase Laves behavior was first established by studying stoichiometric and nonstoichiometric TiCr2. Next, alloying effects were investigated with ternary Laves phases based on TiCr2. Different microstructures of two-phase alloys consisting of (Ti,Cr)-bcc+TiCr2 were also examined. Various toughening theories based on vacancies, site-substitutions, crystal structure (C14, C36, or C15) stabilization, and the presence of a second phase were evaluated. The most effective factors improving the toughness of TiCr2 were determined, and toughening mechanisms are suggested.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 695
Copyright
Copyright © Materials Research Society 1997

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References

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