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Polarization of plastic deformation modes in polysynthetically twinned TiAl crystals

Published online by Cambridge University Press:  31 January 2011

V. Paidar ,
K. Kishida  and
M. Yamaguchi
V. Paidar
Affiliation:
Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czech Republic
K. Kishida
Affiliation:
Materials Engineering Laboratory, National Institute for Materials Science, 1–2-1 Sengen, Tsukuba, Ibaraki 305–0047, Japan
M. Yamaguchi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606–8501, Japan
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Abstract

Polarization of deformation twinning (its propagation in a certain sense but not in the opposite one) is taken for granted. However, the same phenomenon can occur for a superdislocation glide as well, as is demonstrated in this paper. The consequences for plastic deformation of polysynthetically twinned TiAl crystals with the lamellar interfaces parallel to the loading direction are discussed. It is not the interface itself that is an obstacle for propagating deformation but also the fact that a deformation mode with the parallel Burgers vector cannot be activated in the neighboring lamella due to the directionality of superdislocation motion leading to additional stress increase.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 3 , March 2003 , pp. 702 - 708
Copyright
Copyright © Materials Research Society 2003

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