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The Correlation of Slip between Adjacent Lamellae in TiAl.

Published online by Cambridge University Press:  26 February 2011

G. Molénat ,
A. Couret ,
M. Sundararaman ,
J. B. Singh ,
G. Saada  and
P. Veyssière
G. Molénat
Affiliation:
Materials Science Division, Bhabha Atomic Research Centre, Mumbai, India
A. Couret
Affiliation:
Materials Science Division, Bhabha Atomic Research Centre, Mumbai, India
M. Sundararaman
Affiliation:
CEMES, CNRS, Toulouse, France.
J. B. Singh
Affiliation:
CEMES, CNRS, Toulouse, France.
G. Saada
Affiliation:
LEM, CNRS-ONERA, Chatillon, France
P. Veyssière
Affiliation:
LEM, CNRS-ONERA, Chatillon, France
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Abstract

In lamellar TiAl, concerted deformation occurs in adjacent true-twin related variants (O/OT). When deformation takes place in a given variant, O, by activation of the slip system with highest shear stress, slip proceeds in the companion variant, OT, by operation of a slip system of the same family in mirror orientation, including the slip direction. Depending on load orientation, the latter system may not necessarily exhibit the highest resolved shear stress. The correlation does not depend upon Burgers vector orientation with respect to the interface.

This property applies to ordinary dislocations and twinning. The variant that conforms the Schmid law is referred to as the pilot variant, the twin-related variant is dubbed driven.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S6.6
Copyright
Copyright © Materials Research Society 2005

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References

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