Abstract
Polycrystalline magnesium (Mg) and its alloys have been widely investigated in order to better understand and improve their mechanical properties. However, significant questions remain as to how these materials behave under ultra–high strain-rate loading conditions, especially at elevated temperatures. In view of this, in the present study, elevated temperature combined pressure–and–shear plate impact experiments are employed to investigate the dynamic shearing resistance of polycrystalline commercially pure (99.9%) magnesium at strain-rates in excess of 105 s−1, temperatures up to 500 °C, and shear strains > 100%. The results of the study provide important insights into the shearing resistance of polycrystalline pure Mg under extreme thermomechanical loading conditions and its relationship to the evolution of various inelastic deformation modes – dislocation-mediated slip, deformation twinning, and geometric strain softening – with different mechanisms becoming dominant at different levels of inelastic strains and test temperatures.
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Acknowledgements
The authors would like to acknowledge the financial support of the U.S. Department of Energy through the Stewardship Science Academic Alliance (DE-NA0001989 and DE-NA0002919) in conducting the present research. These experiments were conducted at Case Western Reserve University and since then the PI, Vikas Prakash, has moved to the Institute for Shock Physics at the Washington State University. The authors would also express gratitude to the Swagelok Center for Surface Analysis of Materials (SCSAM) at CWRU for the EBSD data and analysis.
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Wang, T., Prakash, V. Pressure-Shear Plate Impact Investigation of Dynamic Shearing Resistance of Polycrystalline Pure Magnesium at Elevated Temperatures: Twinning and Dislocation-Slip Rates. J. dynamic behavior mater. 7, 610–623 (2021). https://doi.org/10.1007/s40870-021-00312-9
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DOI: https://doi.org/10.1007/s40870-021-00312-9