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Shear Transmission in lamellar Ti-48at.%Al

Published online by Cambridge University Press:  15 February 2011

J. M. K. Wiezorek ,
X. D. Zhang ,
W. A. T. Clark  and
H. L. Fraser
J. M. K. Wiezorek
Affiliation:
The Ohio State University, Department of Materials Science and Engineering 2041 College Rd., Columbus, OH-43210–1179
X. D. Zhang
Affiliation:
The Ohio State University, Department of Materials Science and Engineering 2041 College Rd., Columbus, OH-43210–1179
W. A. T. Clark
Affiliation:
The Ohio State University, Department of Materials Science and Engineering 2041 College Rd., Columbus, OH-43210–1179
H. L. Fraser
Affiliation:
The Ohio State University, Department of Materials Science and Engineering 2041 College Rd., Columbus, OH-43210–1179
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Abstract

The transmission of shear across the interfaces between lamellae of γ-TiAl and α2-Ti3Al has been studied in the case of a room temperature deformed Ti-48A1 alloy containing a significant proportion of the lamellar microstructure. The mechanisms of shear transmission due to dislocation slip has been studiedusing transmission electron microscopy. Dislocations with Burgers vectors given by b=1/3 <1120>are the only products of slip transmission from the γ-TiAl phase to the α2-Ti3Al phase, and essentially no dislocations with b=1/3 <1126> i.e. c-component dislocations, have been observed. Slip transmission has been associated with impingement of certain cross-lamellar twins, formed by deformation in γ-TiAl, with the α2 lamellae. Dislocation based models for the slip transmission processes are proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 231
Copyright
Copyright © Materials Research Society 1997

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