Effects of Near-liquidus Temperature Injection on Microstructure and Mechanical Properties of AZ91D Alloy
The semi-solid magnesium alloys were prepared using injection molding at near liquidus temperatures based on AZ91D alloy.The microstructure of AZ91D alloy at different temperatures was analyzed,and room temperature mechanical properties were measured.Microstructure of the alloy was observed by optical microscopy(OM),and scanning electron microscopy(SEM/EDS).Phase composition analysis was performed by X-ray diffraction(XRD).The results indicate that AZ91D alloy is mainly composed of α-Mg matrix β-Mg17Al12 phase the injection temperature of 595℃ and 600℃ is beneficial to obtain fine and dispersed primary spherical crystals.The mechanical properties of AZ91D alloy formed by injection molding at 595℃ and 600℃ present desirable with tensile strength,yield strength,and elongation of 274 MPa,163 MPa,8.4％and 269 MPa,162 MPa,6.1％,respectively,which are higher than the lower limit values specified by national standards for liquid die-casting parts.
AZ91D AlloyInjection MoldingSemi-solidNear Liquidus LineMicrostructure and Properties
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