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首页> 外文期刊>Philosophical Magazine Letters >Atomic modelling of crack initiation on twin boundaries in alpha-titanium under external tensile loading along various orientations
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Atomic modelling of crack initiation on twin boundaries in alpha-titanium under external tensile loading along various orientations

机译：外部拉伸载荷沿不同方向在α-钛双晶界裂纹萌生的原子模型

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Dislocation-grain boundary interaction is considered as the core issue of fatigue crack initiation in alpha-titanium alloys, where, however, the underlying processes still remain unclear. In the present study, the interaction between < a & rang;-dislocations and coherent twin boundaries is simulated with molecular dynamics under various tensile loading orientations. Plastic deformation is found to depend on the tensile orientation, and two typical processes are revealed. In the first, the dislocation transfers into the neighbour grain across the boundary, promoting deformation twinning followed by basal crack initiation, while in the second, the dislocation rebounded at the boundary, resulting in basal crack nucleation therein. In both cases, residual defect structures are left at the boundaries. These results indicate that there exist a wide range of loading orientations, under which dislocation-coherent twin boundary interaction promotes crack initiation on the basal plane; hence, implying its potential relevance to fracture faceting in alpha-titanium alloys.
机译：位错-晶界相互作用被认为是α-钛合金中疲劳裂纹萌生的核心问题，然而，其潜在过程仍不清楚。在本研究中，在不同拉伸载荷取向下，利用分子动力学模拟了

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