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Structure of Dislocations and Mechanical Properties of B2 Alloys

Published online by Cambridge University Press:  14 February 2012

V. Paidar  and
V. Vitek
V. Paidar
Affiliation:
Institute of Physics AS CR, Na Slovance 2, 182 21 Praha 8, Czech Republic
V. Vitek
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, U.S.A
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Abstract

Adequate mechanical properties are important for both structural and functional applications of materials. There are significant differences in mechanical behaviour of different B2 ordered alloys and these are related to the properties of superlattice dislocations. Several types of dislocations can be activated, in particular <111> and <001> dislocations gliding on {110} planes. Their mobility can vary markedly from material to material and this has a strong impact on the mechanical properties. With the aim to elucidate qualitatively the differences between different alloys crystallising in the same B2 structure we analyse possible dislocation dissociations. The model employed is based on the isotropic elasticity but includes an important characteristic of stacking-fault-like defects involved in the splittings, the deviation of their displacements away from the usually assumed ½<111> APB.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1373: Symposium S4 – Advanced Structural Materials—2011 , 2012 , imrc11-1373-s4-01
Copyright
Copyright © Materials Research Society 2012

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