Open AccessMolecular dynamics study of deformation mechanism of γ-TiAl intermetallics
Author(s) -
Zhou Zong-Rong,
Yu Wang,
Yuanming Xia
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.1526
Subject(s) - crystal twinning , intermetallic , stacking fault energy , slip (aerodynamics) , materials science , stacking fault , molecular dynamics , brittleness , deformation mechanism , planar , dislocation , condensed matter physics , thermodynamics , metallurgy , physics , composite material , microstructure , computer graphics (images) , alloy , computer science , quantum mechanics
The generalized planar fault (GPF) energies of various slip systems in γ-TiAl intermetallics are studied by using molecular dynamics (MD) method. The unrelaxed and relaxed GPF curves of various slip systems are compared. It was show that the γ-TiAl has fewer mobile slip systems than the fcc crystal. It is also found that the γ-TiAl intermetallics would exhibit brittle behavior at ambient temperature. The relaxed generalized stacking and twinning fault energy curves of (1/6)〈112〉{111} twinning system are obtained. By analyzing the unstable stacking fault energy γusf, the stable stacking fault energy γsf, and the unstable twinning fault energy γutf, it can be predicted that the major deformation mechanisms are twinning (1/6)〈112〉{111} and ordinary dislocation slip (1/2)〈110〉{111}, as well as superdislocation slip (1/2)〈011〉{111}.