L. G. Zhou1, L. M. Hsiung2, Hanchen Huang1
CMES-Computer Modeling in Engineering & Sciences, Vol.6, No.3, pp. 245-252, 2004, DOI:10.3970/cmes.2004.006.245
Abstract Using molecular dynamics simulations,
we study the deformation of polysynthetically twinned
(PST) TiAl at room temperature. The simulation cell
is pre-strained and thermodynamically relaxed to zero
stress, so that no dislocations pre-exist in γ−α2 interfaces. A uniaxial compression is then applied along one
1/6<112] direction. Our results show that interfacial
dislocation pairs nucleate at the γ−α2 interface under
the compression. The glide and agglomeration of these
dislocations lead to the nucleation of deformation twins
from the interface. Based on our studies, twins may nucleate without pre-existing interfacial dislocations. Further we have monitored the propagation of the More >
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