Effect of Zr Content on Microstructure and Mechanical Properties of Er Modified Al7Si0.3Mg Alloy
Add Zr to Al7Si0.3Mg alloy containing 0.3％Er,characterize the microstructure of the sample using Optical Microscopy(OM)and Scanning Electron Microscopy(SEM),analyze the phase composition using high-resolution X-Ray Diffraction(XRD),and test its mechanical properties.Study the effect of different contents of Zr on the microstructure morphology and mechanical properties of the alloy.The results showed that after adding Zr element,Zr and Er formed second phase particles Al3Er and Al3Zr,which played a dual nucleation and refinement role in the solidification process of aluminum liquid,significantly refining α-Al.The branching of Al and eutectic Si improves the mechanical properties of the alloy.But if Zr is added too much,it will form too many intermetallic compounds with Er inside the alloy,weaken the modification effect,and cause a decrease in tensile strength and elongation.The best effect is achieved when the Zr content is 0.2％,with a tensile strength of 182 MPa and an elongation of 6.4％,which is 16.7％and 33.3％higher than the alloy without the addition of Zr element in terms of tensile strength and elongation,respectively.
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