Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations
Xie Hong-Xian(谢红献)a)†, Wang Chong-Yu(王崇愚)a)b)c), Yu Tao(于涛)a), and Du Jun-Ping(杜俊平)a)
a Central Iron and Steel Research Institute, Beijing 100081, China; b International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China; c Department of Physics, Tsinghua University, Beijing 100084, China
Abstract The mechanism of low-temperature deformation in a fracture process of L12 Ni3Al is studied by molecular dynamic simulations. Owing to the unstable stacking energy, the [ 0$\bar{1}$1] superdislocation is dissociated into partial dislocations separated by a stacking fault. The simulation results show that when the crack speed is larger than a critical speed, the Shockley partial dislocations will break forth from both the crack tip and the vicinity of the crack tip; subsequently the super intrinsic stacking faults are formed in adjacent {111} planes, meanwhile the super extrinsic stacking faults and twinning also occur. Our simulation results suggest that at low temperatures the ductile fracture in L12 Ni3Al is accompanied by twinning, which is produced by super-intrinsic stacking faults formed in adjacent {111} planes.
Received: 29 June 2008
Revised: 20 August 2008
Accepted manuscript online:
(Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure)
Fund: Project supported by the National
Basic Research Program of China (Grant No 2006CB605102) and the
National Natural Science Foundation of China (Grant No 90306016).
Cite this article:
Xie Hong-Xian(谢红献), Wang Chong-Yu(王崇愚), Yu Tao(于涛), and Du Jun-Ping(杜俊平) Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations 2009 Chin. Phys. B 18 251
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