This study examines Mg-Y binary alloys at a high strain rate of approximately 1 × 103 s−1 in compression by using a split Hopkinson pressure bar to elucidate the effect of yttrium in magnesium on mechanical anisotropy and other properties. As a result of high strain rate compression, Mg-0.6 at.%Y alloy showed less mechanical anisotropy, a lower strain hardening rate, and a larger compressive strain to failure of approximately 0.4, as compared with pure magnesium. Microstructure analysis by scanning electron microscopy/electron backscatter diffraction revealed that the addition of yttrium could release the stress concentration at the interface between the matrix and the {\( 10\bar{1}2 \)} c-axis tension twins by the formation of subgrains and lattice rotation around the c-axis during dynamic compression.
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This work was supported in part by Toyota Motor Corporation and by a Grant-in-Aid for Scientific Research (No. 25246012) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. The author (T. M.) thanks Profs. Kazuhiro Hono and Tadakatsu Ohkubo at National Institute for Materials Science, Japan, for the use of 3DAP.
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Nagao, M., Terada, T., Somekawa, H. et al. Deformation Behavior of Binary Mg-Y Alloy Under Dynamic Compression Loading. JOM 66, 305–311 (2014). https://doi.org/10.1007/s11837-013-0854-2
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DOI: https://doi.org/10.1007/s11837-013-0854-2