Computer simulation of superdislocation dissociation in Ni{sub 3}Al
- South China Univ. of Technology, Guangzhou (China). Inst. of Materials Science
The dissociation of a [{bar 1}01] superdislocation in Ni{sub 3}Al is studied by computer simulation techniques using the embedded atom method (EAM). Three types of dissociation are obtained, depending on the initial position of the elastic centers of the superdislocation. One is the stable planar dissociation that the superdislocation dissociates on only one {l_brace}111{r_brace} plane into a pair of 1/2 [{bar 1}01] superpartials separated by an antiphase boundary (APB). Another stable dissociation is that it occurs on two adjacent {l_brace}111{r_brace} planes joined by an intersecting {l_brace}111{r_brace} or (010) plane. The metastable one is that the dissociation occurs in T shape; the superdislocation dissociates on two intersecting {l_brace}111{r_brace} planes into three partials: one 1/2 [{bar 1}01] partial and two widely separated 1/6{l_brace}112{r_brace} Shockley partials with a complex stacking fault (CSF) in between.
- OSTI ID:
- 634672
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 12 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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