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Analysis of extended dislocation faults

Published online by Cambridge University Press:  31 January 2011

Arun M. Kumar  and
John P. Hirth
Arun M. Kumar
Affiliation:
Department of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920
John P. Hirth
Affiliation:
Department of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920
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Abstract

The relative stability of standard extended dislocation dipoles and some new stable defects with lozenge-shaped cross sections have been numerically estimated. An earlier study of these defects in an isotropic fee structure has been extended to the anisotropic case to assess the effect of anisotropy on the calculations. The study is further extended to the case of the L12 crystal structure of the ordered alloy Ni3Al, where the Burgers vectors are large. Results indicate that the introduction of anisotropy has a small effect in determining the relative stability of extended dislocation faults. The results also show that the large values of the Burgers vectors stabilize the arrays in Ni3Al and that the most stable defect favored is the screw lozenge array LD.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1718 - 1721
Copyright
Copyright © Materials Research Society 1992

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