Effects of Er and Zn on Microstructure and Properties of As-cast Al-9Si-0.6Fe-0.2Mn-0.2Mg Alloys
Al-9Si-0.6Fe-0.2Mn-0.2Mg-X(X=0.2Er,0.4Er,0.6Er,0.4Er+1.5Zn,%)alloys were prepared by horizontal die casting machine.The microstructure and mechanical properties of die casting and tensile specimens were investigated by means of metallographic microscope,scanning electron microscope,electron probe and electronic uni-versal material tester.The results indicate that with single addition of 0.4%Er,the modification effect of α-Al and eutectic Si is desirable,where the tensile strength is 228.1 MPa.With compound addition of 0.4%Er + 1.5%Zn,the eutectic Si and α-Al phase become finer and rounder,improving the comprehensive mechanical properties of the alloy,where the tensile strength,elongation and hardness reach 278.2 MPa,6.3%and 91.9 HV,respectively.
Al-Si Die Casting AlloyErZnMicrostructureMechanical Properties
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