Abstract
ABSTRACTThe stacking fault energy (SFE) is of great significance to understand deformation behaviour of materials. Calculated by different models, the SFEs show differences and influence our understanding. Several typical models have been applied to γ-TiAl and discussed with Ab initio calculation systematically. Different models have a little effect on the calculated intrinsic stacking fault energy (ISFE), while affect the calculated unstable stacking fault energy (USFE) a lot. An alias-to-affine deformation transform is being found in 6-layer model. The local energy analysis indicates it is caused by the intrinsic properties of the materials. Combined with experiment observation and theoretical prediction, deformation patterns are compared and discussed.
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