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: Bin Li, S.J. Horstemeyer, Zackery Mcclelland, Q. Ma
Rok vydání: 2013
Předmět:
Zdroj: Metallurgical and Materials Transactions A. 44:4480-4485
ISSN: 1543-1940
1073-5623
DOI: 10.1007/s11661-013-1948-8
Popis: 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.
Databáze: OpenAIRE
Externí odkaz: