Effect of elastic center on dislocation core structure in Ni{sub 3}Al
- Shanghai Jiao Tong Univ. (China). Dept. of Materials Science and Engineering
The dislocation core structure of 1/2[{bar 1}01] superpartials in Ni{sub 2}Al is studied, using the embedded atom method (EAM) and computer simulation techniques. It is found that the initial position of the dislocation elastic center relative to the atomistic lattice-site has pronounced effect on the dislocation core structure. Two typical cores of the 1/2[{bar 1}01] superpartials separated by an antiphase boundary (APB) on (111) planes are obtained. The most stable core is non-planar, spread on both (1{bar 1}1) and the (111) planes, while the metastable one is planar, spread only on the (111) APB plane. Three typical cores of the 1/2[{bar 1}01] superpartials separated by an APB on (010) planes are obtained. They are non-planar without any exception. The most stable core spreads again on both the (1{bar 1}1) and the (111) planes, while the metastable types spread either on the (111) or on the (1{bar 1}1) plane.
- OSTI ID:
- 483617
- Journal Information:
- Acta Materialia, Vol. 45, Issue 3; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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