The grain size and texture dependence of tensile properties in extruded Mg-9Al-1Zn

The tensile properties at room temperature similar to 573 K of Mg-9Al-lZn p rocessed by normal extrusion were compared with those processed by equal ch annel angular (ECA) extrusion. The strength at room temperature was strongl y affected by the grain size. However, the effect of the grain size rapidly decreased with testing temperature. At room temperature, the normal extrud ed alloy showed the stronger grain size dependence of 0.2% proof stress tha n the ECA extruded alloy because of the microscopic orientation effect. Als o, the grain size dependence was. reduced when grain boundaries were in a n on-equilibrium state.