The Effect of Extrusion Temperatures on Microstructure and Mechanical Properties of Mg-1.3Zn-0.5Ca (wt.%) Alloys

The present work mainly investigated the effect of extrusion temperatures on the microstructure and mechanical properties of Mg-1.3Zn-0.5Ca (wt.%) alloys. The alloys were subjected to extrusion at 300 degrees C, 350 degrees C, and 400 degrees C with an extrusion ratio of 9.37. The results demonstrated that both the average size and volume fraction of dynamic recrystallized (DRXed) grains increased with increasing extrusion temperature (DRXed fractions of 0.43, 0.61, and 0.97 for 300 degrees C, 350 degrees C, and 400 degrees C, respectively). Moreover, the as-extruded alloys exhibited a typical basal fiber texture. The alloy extruded at 300 degrees C had a microstructure composed of fine DRXed grains of similar to 1.54 mu m and strongly textured elongated unDRXed grains. It also had an ultimate tensile strength (UTS) of 355 MPa, tensile yield strength (TYS) of 284 MPa, and an elongation (EL) of 5.7%. In contrast, after extrusion at 400 degrees C, the microstructure was almost completely DRXed with a greatly weakened texture, resulting in an improved EL of 15.1% and UTS of 274 MPa, TYS of 220 MPa. At the intermediate temperature of 350 degrees C, the alloy had a UTS of 298 MPa, TYS of 234 MPa, and EL of 12.8%.

Automated summary

The study investigated the effect of extrusion temperatures on Mg-1.3Zn-0.5Ca alloys, finding that higher temperatures led to larger and more dynamic recrystallized grains. The alloys extruded at different temperatures showed varying mechanical properties, with improved elongation at 400 degrees C but higher ultimate tensile strength and yield strength at 300 degrees C.