1. Transfer or blockage: Unraveling the interaction between deformation twinning and grain boundary in tantalum under shock loading with molecular dynamics.
- Author
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Meng, Z.C., Yang, M.M., Feng, A.H., Qu, S.J., Zhao, F., Yang, L., Yao, J.H., Yang, Y., Fan, Q.B., and Wang, H.
- Subjects
CRYSTAL grain boundaries ,TWIN boundaries ,MOLECULAR dynamics ,TANTALUM ,STRESS concentration ,DEFORMATIONS (Mechanics) - Abstract
• The interaction between deformation twinning and grain boundary (GB) is categorized as twin transfer (TT), twin-induced dislocation (TID) and twin block (TB). • Misorientation angles is crucial as it determines the overall structure and stress distribution, while the geometric compatibility factor and the Schmid factor are important as they determine whether there are suitable twin variants to be activated. • The twin morphology under TT and TB appears as ruler and lenticular shapes, respectively. The interaction between {112}<111> deformation twinning and grain boundary in coaxial polycrystalline tantalum under shock compression was studied with molecular dynamics simulation under different grain pair misorientation angles (MA) and geometric compatibility factor (m '). Generally, in the coaxial polycrystal, the value of MA determines the occurrence of twin transfer (TT) or twin blockage (TB), i.e., twin transfer occurs at MA ≤ 29° with twin blockage otherwise. Under TT, the value of m ' affects the selection of twin variants., i.e., the twin system with a larger m ' is easier to active. The morphology of twin pairs is ruler-shaped and lenticular under TT and TB, respectively, with different thickening mechanisms, including grain boundary dislocation emission. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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