Anomalous Strain Rate Sensitivity of $$ \{ 10\overline{1}2\} $$ $$ \langle 10\overline{1}\overline{1}\rangle $$ Twinning in a Magnesium Alloy at High Temperature.

Autor: Ma, Quancang, Li, Bin, Mcclelland, Zackery, Horstemeyer, Stephen
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Zdroj: Metallurgical & Materials Transactions. Part A; Oct2013, Vol. 44 Issue 10, p4480-4485, 6p, 2 Diagrams, 2 Graphs
Abstrakt: 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, relatively high density twins are activated, but much fewer twins were observed at 30 mm min; at 50 mm min, 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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