Abstract
The effects of volume fraction of pre-introduced {10−12} extension twins on adiabatic shear sensitivity of AM30 magnesium (Mg) alloys were studied via dynamic compression experiments using a split Hopkinson pressure bar (SHPB). The relationship between adiabatic shear sensitivity and volume fraction of twins was analyzed by combining mechanical responses and microscopic analysis. The recrystallization mechanism in the adiabatic shear bands (ASBs) was investigated as well. According to the results, the adiabatic shear sensitivity of AM30 Mg alloys increased with the increase in the volume fraction of twins, while the degree of recrystallization in the shear band decreased. The recrystallization mechanism in the shear band was found to obey rotational dynamic recrystallization (RDRX). • The effect of volume fractions of {10–12} extension twins on the adiabatic shear sensitivity of AM30 magnesium alloys under high strain rate impact was investigated in the first time. • The adiabatic shear sensitivity of the AM30 alloy increased with the increasing volume fraction of extension twins. • The recrystallization in shear bands occurred by rotational dynamic recrystallization based on the calculation of dynamic equation.
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