Abstract
Anomalous strain rate sensitivity of \( \{ 10\overline{1} 2\} \) \( \langle 10\overline{1}\overline{1}\rangle \) twinning was observed in a Mg-Al-Mn magnesium alloy during extrusion around 723 K (450 °C). The density of \( \{ 10\overline{1}2\} \) \( \langle 10\overline{1}\overline{1}\rangle \) twins decreases as the ram speed increases. At 10 mm min−1, relatively high density twins are activated, but much fewer twins were observed at 30 mm min−1; at 50 mm min−1, twins were hardly seen. The negative strain rate sensitivity was ascribed to the interaction of \( \{ 10\overline{1}2\} \) \( \langle 10\overline{1}\overline{1}\rangle \) twinning with defects.
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This work was supported by the Department of Energy (Contract No. DE-FC-26-06NT42755) and the Center for Advanced Vehicular Systems (CAVS) at Mississippi State University.
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Manuscript submitted May 13, 2013.
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Ma, Q., Li, B., Mcclelland, Z. et al. Anomalous Strain Rate Sensitivity of \( \{ 10\overline{1}2\} \) \( \langle 10\overline{1}\overline{1}\rangle \) Twinning in a Magnesium Alloy at High Temperature. Metall Mater Trans A 44, 4480–4485 (2013). https://doi.org/10.1007/s11661-013-1948-8
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DOI: https://doi.org/10.1007/s11661-013-1948-8