不同合金元素对Mg15Al高铝镁合金组织与性能的影响

研究了不同合金元素（Zn，Nd，Si）对Mg15Al镁合金的组织和性能的影响。通过对Mg15Al，Mg15Al1Zn，Mg15Al1Si，Mg15Al1．5Nd四种合金微观组织的观察和力学性能的测定，发现添加了合金元素后Mg合金组织中α—Mg基体和β—Mg17Al12相都得到了不同程度的细化，其中Mg15Al1Si，Mg15Al1．5Nd合金组织中有第三相生成，其形态分别为汉字状、块状，长针状。试验结果表明：添加zn和Nd元素后，抗拉强度比Mg15Al合金显著提高。提高幅度分另4为：13．2％和16．6％，而添加si元素后Mg15Al1Si合金抗拉强度比Mg15Al合金低。添加Nd元素后，伸长率比Mgl5Al合金显著提高，增幅为140％，添加了Si元素和Zn元素后，伸长率比Mg15Al合金低。

Effect of Different Alloying Elements on the Microstructure and Properties of Mg15Al High-magnesium Alloy

The microstructure and mechanical properties of Mg15Al-x （x= Zn, Nd,Si）alloy were investigated by OM and tensile property test respectively.The results showed that the primary α-Mg and β-Mg17Al12 phase in Mg15Al magnesium alloy were obviously refined in varying degrees by adding Zn,Nd,Si element.The needle-like All 1Nd3 phase emerges in Mg15Al1.5Nd alloy. Chinese-like and block Mg2Si phase were observed in MglSAllSi alloy.When Zn and Nd element were added into the Mg15Al magnesium alloy, the tensile strength was improved remarkably, increasing by 13.2% and 16.6%, respectively, while adding Si element the tensile strength of Mg15Al alloy decreased.The elongation of MglSA1 alloy increased by 140% due to adding of Nd element, however the elongation of Mg15Al alloy decreases after adding of Zn and Si.