Dislocation formation and twinning from the crack tip in Ni3Al: molecular dynamics simulations

被引：21

作者：

Xie Hong-Xian ^{[1
]}

Wang Chong-Yu ^{[1
,2
,3
]}

Yu Tao ^{[1
]}

Du Jun-Ping ^{[1
]}

机构：

[1] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China

[2] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China

[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

CHINESE PHYSICS B | 2009年 / 18卷 / 01期

基金：

中国国家自然科学基金;

关键词：

molecular dynamic; crack; Shockley partial dislocation; stacking fault; SINGLE-CRYSTAL SUPERALLOY; 110 SCREW DISLOCATIONS; LI-2 ORDERED ALLOYS; ATOMISTIC SIMULATIONS; COMPUTER-SIMULATION; FAULT ENERGIES; CORE STRUCTURE; GAMMA'-PHASE; CREEP; BEHAVIOR;

D O I：

10.1088/1674-1056/18/1/041

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The mechanism of low-temperature deformation in a fracture process of L1(2) Ni3Al is studied by molecular dynamic simulations. Owing to the unstable stacking energy, the [0 (1) over bar1] 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 L1(2) Ni3Al is accompanied by twinning, which is produced by super-intrinsic stacking faults formed in adjacent {111} planes.

引用

页码：251 / 258

页数：8

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