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Tem and Computer Image Simulation Studies on the Dissociation of Superdislocations in Ll2 Al3Ti Alloy

Published online by Cambridge University Press:  22 February 2011

Yonghua Rong ,
Xiaohua Wu ,
Xiaofu Chen ,
Shipu Chen  and
Gengxiang Hu
Yonghua Rong
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Xiaohua Wu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Xiaofu Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Shipu Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
Gengxiang Hu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, China
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Abstract

TEM investigation associated with computer image simulations were conducted to determine the dislocation core structure in the Ll2 Al67MnsTi25 alloy deformed at room temperature. It is identified that the a<110> superdislocations dissociated into pairs of a/3<112> superpartials with SISF between them. The theoretical and experimental micrographs are in good agreement under various diffraction conditions. The unusual temperature dependence of flow stress at low temperature can be related to the SISF-type dissociation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1221
Copyright
Copyright © Materials Research Society 1995

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