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通过普通凝固技术获得5种含有二十面体准晶相Zn6Mg3Y1的Mg-Zn-Y合金,按质量比2∶5与AZ91D熔合制备实验合金。利用金相显微镜(OM)、扫描电镜(SEM)观察合金微观组织形貌;用扫描电镜附带的能谱分析仪(EDS)分析其微区化学成分;采用维氏硬度测试仪测试合金硬度;用热膨胀分析仪测定合金的热膨胀系数;模拟海洋环境下,测试合金的电化学腐蚀性能。结果表明:二十面体准晶相Zn6Mg3Y1的添加提高了AZ91D镁合金的硬度;降低了AZ91D镁合金的热膨胀系数,并表现出良好的高温热稳定性;AZ91D镁合金的抗腐蚀性能得到显著改善,腐蚀电流密度较AZ91D合金有1～2个数量级的提高。
Five kinds of Mg-Zn-Y alloys containing icosahedral quasicrystal phase Zn6Mg3Y1 were obtained by ordinary solidification technique. The experimental alloys were prepared by fusion with AZ91D at a mass ratio of 2: 5. The microstructure of the alloy was observed by OM and SEM. The micro-chemical composition was analyzed by energy dispersive spectrometer (EDS) attached with SEM. The hardness of the alloy was measured by Vickers hardness tester. Thermal expansion analyzer to determine the thermal expansion coefficient of the alloy; simulate the marine environment, the electrochemical corrosion test alloy. The results show that the addition of icosahedral quasicrystalline Zn6Mg3Y1 increases the hardness of AZ91D magnesium alloy, decreases the thermal expansion coefficient of AZ91D magnesium alloy and exhibits good high temperature thermal stability. The corrosion resistance of AZ91D magnesium alloy is significantly improved, Corrosion current density than AZ91D alloy 1 to 2 orders of magnitude increase.