Effect of Heat Treatment on Microstructure and Properties of Die Casting Mg-Zn-Al-Mn Alloy
Mg-Zn-Al-Mn alloy was prepared by die casting,and the effect of different heat treatment on mechanical properties and microstructure of Mg-Zn-Al-Mn alloy was studied.The results show that the tensile strength,yield strength and elongation of the die-cast alloy are 236 MPa,149 MPa and 7.3%,respectively.After solid solution treatment,the supersaturated solid solubility increases,and most of the second phase particles dissolve into the magnesium matrix during the solid solution process.The mechanical properties of 335℃×4 h+190℃×5 h alloy were the best,the tensile strength,yield strength and elongation were 243 MPa,167 MPa and 5.1%,respectively.The immersion test shows that the alloy treated with T6 has the best immersion corrosion resistance.The electrochemical test results show that the alloy treated with T6 has the minimum corrosion current density and the maximum high frequency impedance arc radius,the resultswhich shown that it has the best corrosion resistance.
die casting Mg-Zn-Al-Mn alloyheat treatmentmechanical propertiesmicrostructurecorrosion
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