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利用万能材料试验机和失重法分别研究了Sr、Mn复合添加对含0.2%Fe的AZ91镁合金力学性能和耐蚀性的影响。结果表明:合金组织的主要相为α-Mg、β-Mg17Al12、Al4Sr和Al6Mn。Mn的加入可提高合金的力学性能,当添加0.5%Sr和0.5%Mn时,合金的铸态和T6热处理的抗拉强度达到最大值,分别为128、174 MPa。在0.5%Sr时,Mn的加入能显著提高合金耐腐蚀性。本试验中,复合加入0.5%Sr和0.8%Mn,经T6热处理后的合金腐蚀速率最小,为1.4 mg.cm-2.d-l。
The effects of Sr and Mn addition on the mechanical properties and corrosion resistance of AZ91 magnesium alloy containing 0.2% Fe were studied by using universal testing machine and weight loss method respectively. The results show that the main phases of the alloy are α-Mg, β-Mg17Al12, Al4Sr and Al6Mn. When adding 0.5% Sr and 0.5% Mn, the tensile strength of the as-cast and T6 heat-treated alloys reached the maximum values of 128 and 174 MPa, respectively. In 0.5% Sr, the addition of Mn can significantly improve the alloy corrosion resistance. In this experiment, 0.5% Sr and 0.8% Mn were added into the composite, the corrosion rate of the alloy after T6 heat treatment was the smallest, 1.4 mg.cm-2.d-l.