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The Role of Phase Stability in Ductile, Ordered B2 Intermetallics

Published online by Cambridge University Press:  26 February 2011

James R. Morris ,
Yiying Ye ,
Maja Krcmar  and
Chong Long Fu
James R. Morris
Affiliation:
morrisj@ornl.gov, Oak Ridge National Laboratory, Materials Science & Technology Division, P.O. Box 2008, Oak Ridge, TN, 37831-6115, United States
Yiying Ye
Affiliation:
yiying ye@hotmail.com, Ames Laboratory, Iowa State University, Ames, IA, 50011, United States
Maja Krcmar
Affiliation:
krcmarm@ornl.gov, Grand Valley State University, Physics Department, One Campus Drive, PAD 144, Allendale, MI, 49401-9403, United States
Chong Long Fu
Affiliation:
cfu@ornl.gov, Oak Ridge National Laboratory, Materials Science & Technology Division, P.O. Box 2008, Oak Ridge, TN, 37831, United States
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Abstract

We discuss the underlying atomistic mechanism for experimentally observed large tensile ductility in various strongly ordered B2 intermetallic compounds. First-principles calculations demonstrate that all of the compounds exhibit little energy differences between the B2, B27 and B33 phases. These calculations relate observations of ductility in YAg, YCu and ZrCo to shape-memory materials including NiTi. One transformation pathway between the B2 and B33 phases establishes a connection between this phase competition, and stacking faults on the {011}B2 plane. The low energy of such a stacking fault will lead to splitting of the b=<100> dislocations into b/2 partials, observed in ZrCo, TiCo, and in the B19' phase of NiTi. Calculations demonstrate that this pathway is competitive with the traditional pathway for NiTi.

Keywords

ductilityalloyphase equilibria
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II06-10
Copyright
Copyright © Materials Research Society 2007

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