Tension-compression asymmetry in homogeneous dislocation nucleation stress of single crystals Cu, Au, Ni and Ni3Al
HX Xie and T Yu and FX Yin, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 604, 142-147 (2014).
Molecular dynamics simulations are used to investigate the mechanism of the homogenous dislocation nucleation stress asymmetry under applied uniaxial tensile and compressive loads in single crystals Cu, Au, Ni and Ni3Al. The effect of temperature on the homogeneous dislocation nucleation stress and the ratio of tension-compression asymmetry are studied; furthermore, the ratios of tension-compression asymmetry are carefully investigated in term of unstable stacking fault energy and the atomic stacking configurations of the 111 slip planes. It is found that the tension-compression asymmetry of the homogenous dislocation nucleation stress can be attributed to that the atomic stacking configurations of the 111 slip planes are not symmetrical about the 1 (1) over barO axis, which leads to nucleate different types of leading partial dislocations during compression and tension. (C) 2014 Elsevier B.V. All rights reserved.
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