Capture Deformation Twinning in Mg during Shock Compression with Ultrafast Synchrotron X-Ray Diffraction
S Chen and YX Li and NB Zhang and JW Huang and HM Hou and SJ Ye and T Zhong and XL Zeng and D Fan and L Lu and L Wang and T Sun and K Fezzaa and YY Zhang and MX Tang and SN Luo, PHYSICAL REVIEW LETTERS, 123, 255501 (2019).
Deformation twinning plays a vital role in accommodating plastic deformation of hexagonal-closepacked (hcp) metals, but its mechanisms are still unsettled under high strain rate shock compression. Here we investigate deformation twinning in shock-compressed Mg as a typical hcp metal with in situ, ultrafast synchrotron x-ray diffraction. Extension twinning occurs upon shock compression along < 11<(2 > over bar>0) and < 10 (1) over bar0 >, but only upon release for loading along < 0001 >. Such deformation mechanisms are a result of the polarity of deformation twinning, which depends on directionality and relative magnitude of resolved shear stress and may be common for Mg and its alloys in a wide range of strain rates.
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