The effect of Y content on microstructure and tensile properties of the as-extruded Mg–1Al–xY alloy

Abstract

The Mg–1Al–xY (x = 3, 5, 8) alloys were prepared by melting technology and extruded at 400 °C. Microstructures of the alloys were investigated by X-ray diffraction (XRD), optical microscope (OM), and scanning electron microscope (SEM). Tensile properties of the alloys were measured. The results showed that the as-extruded Mg–1Al–xY (x = 3, 5, 8) alloys were composed of α-Mg phase and Al2Y phase and the microstructures were main dynamic recrystallization. The eutectic Al2Y phase was broken down to finer particles and dispersed more uniformly after the extrusion. The extruded alloys have (0002) basal plane texture. The tensile strength, yield strength and elongation of Mg–1Al–8Y alloy were 288 MPa, 174 MPa and 20% at room temperature, respectively. Therefore, the alloys have good mechanical properties and the fracture morphology with ductile features.