In order to understand the asymmetry of extruded AZ31B magnesium alloy between dynamic tension and compression

texture analysis was performed

and dynamic compression and tension tests at extruded direction and transverse direction were carried out using a split Hopkinson pressure bar and a reflected hopkinson tension bar apparatus with average strain rates in the range of 500

2

650 s-1.The results show that due to the formation of basal plane texture during the extruding process

extension twins {1012}

<

1120

>

are activated easily when the alloy is compressed along extruding direction

so yield stress is lower and insensitive to strain rates.When the alloy is tensioned along extruding direction

due to the tensile twins not be activated

contract twins {1011}

<

1120

>

and non-basal slips are the main deformation mechanisms

leading to the higher yield stress of the alloy.The alloy shows a strong asymmetry between compression and tension

and the ratio of yield stress between compression and tension is about 0.30.Absence of asymmetry along transverse direction can be observed.