|Atomic modelling of crack initiation on twin boundaries in alpha-titanium under external tensile loading along various orientations|
|H. Wang; D. S. Xu; R. Yang
|Source Publication||Philosophical Magazine Letters
|Abstract||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.|
; xu, d. s.
; yang, r.] chinese acad sci, inst met res, shenyang 110016, peoples r china.
; wang, h (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china.
H. Wang,D. S. Xu,R. Yang. Atomic modelling of crack initiation on twin boundaries in alpha-titanium under external tensile loading along various orientations[J]. Philosophical Magazine Letters,2014,94(12):779-785.
H. Wang,D. S. Xu,&R. Yang.(2014).Atomic modelling of crack initiation on twin boundaries in alpha-titanium under external tensile loading along various orientations.Philosophical Magazine Letters,94(12),779-785.
H. Wang,et al."Atomic modelling of crack initiation on twin boundaries in alpha-titanium under external tensile loading along various orientations".Philosophical Magazine Letters 94.12(2014):779-785.
|Files in This Item:||
||There are no files associated with this item.
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.