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Pseudo-Twinning in A Deformed Nb-15Al-25Ti B2 Alloy

Published online by Cambridge University Press:  22 February 2011

S.-S. Yang ,
D.-H. Hou ,
J. Shyue ,
R. Wheeler  and
H. L. Fraser
S.-S. Yang
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
D.-H. Hou
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
J. Shyue
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
R. Wheeler
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
H. L. Fraser
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
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Abstract

An alloy with nominal composition of Nb-15Al-25Ti (in at.%) has been developed for high temperature structural applications. This alloy exhibits a B2 ordered structure in the as-cast form [1]. In addition to dislocation slip, pseudo-twinning occurs in this B2 alloy when deformed in compression at room temperature at a strain rate of ∼ 10−4 sec−1 to 3% strain. The pseudo-twinning plane has been deduced to be the {112} planes, which is similar to that in twinning of bcc metals. The mechanism of deformation pseudo-twinning in this B2 alloy is found to be analogous to the normal twinning mechanism in bcc metals, involving glide of partial dislocations with Burgers vector (b) given by b=l/6<111= on {112} planes. This pseudo-twinning mechanism causes a phase transformation from the B2 to an ordered orthorhombic structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1359
Copyright
Copyright © Materials Research Society 1995

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References

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