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Shock Response of Commercial Purity Polycrystalline Magnesium Under Uniaxial Strain at Elevated Temperatures

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Abstract

In the present paper, results of plate impact experiments designed to investigate the onset of incipient plasticity in commercial purity polycrystalline magnesium (99.9%) under weak uniaxial strain compression and elevated temperatures up to melt are presented. The dynamic stress at yield and post yield of magnesium, as inferred from the measured normal component of the particle velocity histories at the free (rear) surface of the target plate, are observed to decrease progressively with increasing test temperatures in the range from 23 to 500 °C. At (higher) test temperatures in the range 500–610 °C, the rate of decrease of dynamic stress with temperature at yield and post-yield in the sample is observed to weaken. At still higher test temperatures (617 and 630 °C), a dramatic increase in dynamic yield as well as flow stress is observed indicating a change in dominant mechanism of plastic deformation as the sample approaches the melt point of magnesium at strain rates of ~105/s. In addition to these measurements at the wavefront, the plateau region of the free surface particle velocity profiles indicates that the longitudinal (plastic) impedance of the magnesium samples  decreases continuously as the sample temperatures are increased from room to 610 °C, and then reverses trend (indicating increasing material longitudinal impedance/strength) as the sample temperatures are increased to 617 and 630 °C. Electron back scattered diffraction analysis of the as-received and annealed pre-test magnesium samples reveal grain coarsening as well as grain re-orientation to a different texture during the heating process of the samples.

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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 (Grant Nos. DE-NA0001989 and DE-NA0002919) in conducting the present research. The authors would also express gratitude to Swagelok Center for Surface Analysis of Materials (SCSAM) at CWRU for the EBSD data.

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  1. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, 44106-7222, USA

    Tianxue Wang, Bryan Zuanetti & Vikas Prakash

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  1. Tianxue Wang
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  2. Bryan Zuanetti
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  3. Vikas Prakash
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Correspondence to Vikas Prakash.

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Wang, T., Zuanetti, B. & Prakash, V. Shock Response of Commercial Purity Polycrystalline Magnesium Under Uniaxial Strain at Elevated Temperatures. J. dynamic behavior mater. 3, 497–509 (2017). https://doi.org/10.1007/s40870-017-0128-0

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  • DOI: https://doi.org/10.1007/s40870-017-0128-0

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