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Deformation Mechanisms and Mechanical Properties of B2 Compounds in Ti-Modified Nb-Al Alloys

Published online by Cambridge University Press:  01 January 1992

Jein Shyue ,
Duen-Huei Hou ,
Steve Johnson ,
Mark Aindow  and
Hamish Fraser
Jein Shyue
Affiliation:
Department of Materials Science and Engineering The Ohio State University, 2041 College Road, Columbus, OH 43210
Duen-Huei Hou
Affiliation:
Department of Materials Science and Engineering The Ohio State University, 2041 College Road, Columbus, OH 43210
Steve Johnson
Affiliation:
Department of Materials Science and Engineering The Ohio State University, 2041 College Road, Columbus, OH 43210
Mark Aindow
Affiliation:
Now at School of Metallurgy and Materials, and the IRC in Materials for High Performance Applications, University of Birmingham, Elms Road, Edgbaston, Birmingham B15 2TT, UK.
Hamish Fraser
Affiliation:
Department of Materials Science and Engineering The Ohio State University, 2041 College Road, Columbus, OH 43210
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Abstract

The deformation mechanisms have been determined of two compounds based on Nb3Al containing additions of Ti (Nb-15Al-10Ti and Nb-15Al-40Ti, in at.%) such that they exhibited the B2 crystal structure. The compounds are strong over a range of temperatures, at least up to 900°C, and are inherently ductile. The compounds deform by activation of one or more of the following slip systems, namely <111>{110}, <111>{112} and <111>{ 123}. The dislocations are present in the form of dissociated superpartial pairs, each with Burgers vector, b, given by b=1/2<111>, which bound a ribbon of antiphase boundary(APB). From the separation of the partial dislocations, the APB energy decreases with increasing amounts of Ti.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 573
Copyright
Copyright © Materials Research Society 1995

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