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Mechanical Twinning in Duplex Ti-48Al-2Nb-2Cr at 1038K

Published online by Cambridge University Press:  01 January 1992

Zhe Jin  and
Thomas R. Bieler
Zhe Jin
Affiliation:
Department of Materials Science and Mechanics Michigan State University, East Lansing, Michigan 48824-1226
Thomas R. Bieler
Affiliation:
Department of Materials Science and Mechanics Michigan State University, East Lansing, Michigan 48824-1226
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Abstract

As a part of an ongoing study of creep deformation mechanisms, mechanical twinning behavior was investigated in the lamellar region of a creep specimen. A multi-stress jump creep test was performed and the microstructures before and after deformation were investigated using optical and transmission electron microscopy. The identification of mechanical twins in a lamellar microstructure is discussed. Extensive mechanical twinning was observed in lamellar regions, in addition to slip and subgrain formation. The occurrence of mechanical twinning depended on the lamellar orientation with respect to the tensile axis. The mechanical twins are analyzed and discussed in terms of possible crystallographic twinning systems. In this case, a maximum resolved shear stress criterion for mechanical twinning is proposed to account for the observed orientations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 775
Copyright
Copyright © Materials Research Society 1995

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References

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