Improved phase field model of dislocation intersections

被引:22
|
作者
Zheng, Songlin [1 ,2 ,3 ]
Zheng, Dongchang [1 ,2 ]
Ni, Yong [1 ,2 ]
He, Linghui [1 ,2 ]
机构
[1] Univ Sci & Technol China, CAS Key Lab Mech Behav & Design Mat, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Mech, Hefei 230026, Anhui, Peoples R China
[3] China Acad Engn Phys, Inst Fluid Phys, Natl Key Lab Shockwave Phys & Detonat Phys, Mianyang 621900, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
MOLECULAR-DYNAMICS; FCC METALS; JUNCTIONS; STRENGTH; RANGE; SIMULATIONS; COPPER;
D O I
10.1038/s41524-018-0075-x
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Revealing the long-range elastic interaction and short-range core reaction between intersecting dislocations is crucial to the understanding of dislocation-based strain hardening mechanisms in crystalline solids. Phase field model has shown great potential in modeling dislocation dynamics by both employing the continuum microelasticity theory to describe the elastic interactions and incorporating the y-surface into the crystalline energy to enable the core reactions. Since the crystalline energy is approximately formulated by linear superposition of interplanar potential of each slip plane in the previous phase field model, it does not fully account for the reactions between dislocations gliding in intersecting slip planes. In this study, an improved phase field model of dislocation intersections is proposed through updating the crystalline energy by coupling the potential of two intersecting planes, and then applied to study the collinear interaction followed by comparison with the previous simulation result using discrete dislocation dynamics. Collinear annihilation captured only in the improved phase field model is found to strongly affect the junction formation and plastic flow in multislip systems. The results indicate that the improvement is essential for phase field model of dislocation intersections.
引用
收藏
页数:8
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