Deformation twinning in single-crystal Mg under high strain rate tensile loading: A time-resolved X-ray diffraction study

YX Li and JW Huang and D Fan and L Lu and BB Zhang and T Zhong and B Dai and SW Zhang and Y Tao and YY Zhang and S Chen and SN Luo, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 220, 107106 (2022).

DOI: 10.1016/j.ijmecsci.2022.107106

We investigate deformation twinning in single-crystal Mg with in situ, time-resolved (mu s-scale), synchrotron X-ray diffraction under high strain rate split Hopkinson tension bar loading. Extension twinning occurs upon dynamic tension along (0001), but is absent upon tension along (1120). Such deformation anisotropy is a result of the unipolarity of deformation twinning which depends on directionality and resolved shear stress. The twinning mechanism is common for pure Mg in a wide range of strain rates and different loading conditions (one-dimensional stress and one-dimensional strain).

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