Effect of extrusion parameters on microstructure and mechanical properties of Mg-0.12Ca-0.08Ba alloy

By designing several extrusion parameters, the Mg-0.12Ca-0.08Ba (wt%) alloy with dilute alloy content was processed, the microstructure and tensile property of alloys have been reasonably examined by means of electron backscattered diffraction, scanning electron microscopy and X-ray diffraction. The results demonstrate the grains of Mg-0.12Ca-0.08Ba alloys are refined after extrusion, and the alloys form uniform dynamic recrystallized grains. There are two different types of texture components in the extruded alloy, rare earth texture and extruded fiber texture, which crystallographic orientation is ∥ED and ∥ED, respectively. This “rare earth texture” component was found to be suppressed at high extrusion temperatures. The extrudants at 380 °C exhibits the best performance, its yield strength (YS) and ultimate tensile strength (UTS) are 197 MPa and 252 MPa, respectively, and the elongation-to-fracture (EL) is 33.1%. The plastic enhancement after extrusion mainly comes from grain refinement and texture weakening in the alloys.