研究了稀土元素Gd含量对铸态Mg-0.5Zn-0.4Zr-xGd合金微观组织、力学性能及其腐蚀性能的影响.结果表明:当Gd含量小于5％时,随着Gd含量的提高,第二相沿着晶界析出并且逐渐增多,晶粒明显细化,力学性能和耐蚀性逐渐提高;Gd含量为5％时,合金的力学性能及耐蚀性最好,抗拉强度为174.76 MPa,伸长率为11.25％,平均腐蚀速率仅为0.845 mm/a.Gd含量继续增加,合金力学性能和耐蚀性均呈现劣化趋势.
Effects of rare earth Gd addition on microstructure,mechanical properties and corrosion resistance of as-cast Mg-0.5Zn-0.4Zr-xGd alloys were investigated.The results indicate that when the addition of Gd is less than 5％,with the increasing of Gd,the second phase precipitates along the grain boundaries and the quantity of the precipitation increases,and the grain is refined gradually,the mechanical properties and corrosion resistance improve gradually.When the content of Gd is 5％,the excellent mechanical properties and corrosion resistance of the alloy are obtained,the tensile strength of the alloy is 174.76 M Pa,the elongation is 11.25 ％,and the average corrosion rate is 0.845 mm/a.With the gradually increasing of Gd content higher than 5％,the mechanical properties and corrosion resistance of the alloy show a deterioration trend.
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