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Capture Deformation Twinning in Mg during Shock Compression with Ultrafast Synchrotron X-Ray Diffraction.

S Chen1, Y X Li1, N B Zhang1

  • 1The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.

Physical Review Letters
|January 11, 2020
PubMed
Summary

Deformation twinning in hexagonal-close-packed (hcp) metals like magnesium (Mg) under shock compression is clarified. The study reveals twinning mechanisms depend on shock loading direction and release, offering insights into hcp metal behavior.

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Area of Science:

  • Materials Science
  • Mechanics of Materials
  • Crystallography

Background:

  • Deformation twinning is crucial for plastic deformation in hexagonal-close-packed (hcp) metals.
  • Mechanisms of twinning under high strain rate shock compression remain poorly understood.

Purpose of the Study:

  • To investigate the mechanisms of deformation twinning in shock-compressed magnesium (Mg), a representative hcp metal.
  • To elucidate the role of shock compression and release on twinning behavior in Mg.

Main Methods:

  • In situ, ultrafast synchrotron X-ray diffraction was employed to observe deformation twinning.
  • Magnesium (Mg) was subjected to high strain rate shock compression.

Main Results:

  • Extension twinning was observed along specific crystallographic directions (⟨112[over ¯]0⟩ and ⟨101[over ¯]0⟩) during shock compression.
  • Twinning occurred only upon release for loading along the ⟨0001⟩ direction.
  • The observed deformation mechanisms are attributed to the polarity of deformation twinning, influenced by resolved shear stress.

Conclusions:

  • Deformation twinning in Mg under shock compression exhibits polarity dependent on loading direction and stress magnitude.
  • These findings provide critical insights into the plastic deformation mechanisms of hcp metals at high strain rates.
  • The identified mechanisms may be applicable to magnesium and its alloys across various strain rates.