@Article{cmes.2004.006.245,
AUTHOR = {L. G.  Zhou, L. M.  Hsiung, Hanchen  Huang},
TITLE = {Nucleation and Propagation of Deformation Twin in Polysynthetically Twinned TiAl},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {6},
YEAR = {2004},
NUMBER = {3},
PAGES = {245--252},
URL = {http://www.techscience.com/CMES/v6n3/24846},
ISSN = {1526-1506},
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−α<sub>2</sub> interfaces. A uniaxial compression is then applied along one
1/6<112] direction. Our results show that interfacial
dislocation pairs nucleate at the γ−α<sub>2</sub> 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 deformation twin, specifically its interaction with γ−γ and γ−α<sub>2</sub>
interfaces. The observations show that γ−α<sub>2</sub> interfaces
are stronger obstacles to the twin propagation than γ−γ
interfaces are.},
DOI = {10.3970/cmes.2004.006.245}
}