Compressive properties and fracture analysis of Mg-9Al-5Sn-xSb extruded magnesium alloy under uniaxial compression

Abstract

Effects of Sb element content on mechanical properties, yield strength ratio and compressive fracture morphology of Mg-9Al-5Sn-xSb extruded magnesium alloy bars under uniaxial compression at room temperature were studied. The results show that the compressive mechanical properties of the extruded Mg-9Al-5Sn magnesium alloy bars can be obviously improved by adding element Sb. With the increase of element Sb content, the compressive properties of the extruded Mg-9Al-5Sn-xSb magnesium alloys are gradually enhanced. When the addition of element Sb is 1.5 mass%, the compressive properties of the alloy are the best, its ultimate compressive strength (UCS), compressive yield strength (CYS) and compressive elongation (CEL) are 528 MPa, 307 MPa and 11.0%, respectively. With the increase of element Sb content, the yield strength ratio of the alloys increases first and then decreases. When the content of Sb is 0.6 mass%, the yield strength ratio reaches the maximum value of 0.66, with the continuous increase of Sb content, the yield strength ratio decreases gradually.