Microstructure and Mechanical Properties of Pure Magnesium Subjected to Hot Extrusion

The as-cast pure magnesium (Mg), with a purity of 99.99%, was hot-extruded at 300 o C to prepare a Mg bar with a diameter of 8 mm. The microstructure and mechanical properties of the sample before and after extrusion weis obviously refined with a large number of subgrains rather than equre investigated. The results show that the asextruded microstructure iaxed grains. (10 1 2) tensile twins can be observed significantly in the microstructure at this temperature. Mechanical properties including yield strength (YS), ultimate tensile strength (UTS) increased greatly but uniform elongation (UE) decreased slightly as a result of work hardening.