CAJ | 학술논문

采用常规金属型铸造工艺和磁悬浮熔炼+负压铜模吸铸工艺制备了Mg69.5Li26.8Gd2.5Zn1Zr0.2(a%)双相Mg-Li合金。利用光学显微镜、X射线衍射仪和力学性能试验机等对合金的显微组织及力学性能进行了系统的分析。结果表明，两种方法制备的合金在铸态下都出现了LPSO相。但是，磁悬浮熔炼+负压铜模吸铸工艺比常规金属型铸造所产生的更大的冷却速度，使得合金各相的晶粒/颗粒尺寸显著减小、分布更为均匀弥散。LPSO相形貌从层片状为主的层片+块状混合形态转变为块状、尺寸减小、体积分数明显增加，力学性能显著高于常规金属型铸造工艺制备的合金。
채용상규금속형주조공예화자현부용련+부압동모흡주공예제비료Mg69.5Li26.8Gd2.5Zn1Zr0.2(a%)쌍상Mg-Li합금。이용광학현미경、X사선연사의화역학성능시험궤등대합금적현미조직급역학성능진행료계통적분석。결과표명，량충방법제비적합금재주태하도출현료LPSO상。단시，자현부용련+부압동모흡주공예비상규금속형주조소산생적경대적냉각속도，사득합금각상적정립/과립척촌현저감소、분포경위균균미산。LPSO상형모종층편상위주적층편+괴상혼합형태전변위괴상、척촌감소、체적분수명현증가，역학성능현저고우상규금속형주조공예제비적합금。
Mg69.5Li26.8Gd2.5Zn1Zr0.2 (a%) dual-phase Mg-Li alloy was prepared by conventional metal mold casting and magnetic levitation melting coupled with negative suction casting with copper mould. The microstructures and mechanics properties of as-cast were investigated by means of optimal microscope (OM), X-ray diffraction (XRD) and electronic universal material test machine. The results indicated that LPSO phase was formed by both two methods. However, Compared to the conventional metal mold casting, the fast cooling rate induced by magnetic levitation melting coupled with negative suction casting with copper mould makes the grain/particle size of each phase in the alloy decreases, and the distribution more uniform. Meaningwhile, the morphology of LPSO phase is varied from the dominated lamella to the ifner blocks, and their size was reduced and, the volume fraction increased signiifcantly. And thus, the mechanical properties of the alloy are obviously higher than those by conventional metal mold casting alloy.