Effects of Pouring Temperature on Microstructure and Mechanical Property of Near-liquidus Squeeze Casting AZ91D Alloy
Taking the automobile differential supportor as object,the microstructure and mechanical properties of AZ91D alloy were investigated under different near-liquidus squeeze casting temperatures.The results indicate that when the pouring temperature is increased from 595℃ to 665℃ ,the spherical crystal in the alloy is gradually trans-formed into a rosette-like crystal,and the average grain size is increased from 21.02 μm to 58.13 μm.The content of the second phase β-Mg17Al12 is increased from 18.55%to 49.72%,and its uniformity is gradually weakened.When the pouring temperature is low(595℃ and 605℃ ),there exist a lot of dimples and a small area of cleavage plane in the tensile fracture.The number of dimples and cleavage steps of the fracture is gradually decreased at a higher pouring temperature.At the pouring temperature of 605℃ ,the tensile strength and elongation reach up to 229.2 MPa and 3.16%,respectively.
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