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利用真空电磁感应熔炼炉制备AZ91-XCa(X=0.7%,1.25%,1.74%,2.53%)镁合金,采用光学显微镜(OM)、X射线衍射仪(XRD)和扫描电镜(SEM)等测试方法研究了合金元素Ca对AZ91镁合金显微组织的影响。结果表明:合金的主要物相是由基体Mg,β(Mg17Al12)和Al2Ca组成。随Ca含量增大,β(Mg17Al12)相由不连续的网状转变为细小的条状,同时,有Al2Ca相产生,并且随Ca含量增加,Al2Ca相增加。当Ca含量达到1.25%时,晶粒细化最明显,同时力学性能达到最好,该合金在室温下的抗拉强度达到150MPa,断面收缩率为22.8%。
Magnesium alloys AZ91-XCa (X = 0.7%, 1.25%, 1.74%, 2.53%) were prepared by vacuum electromagnetic induction melting furnace. The microstructures of AZ91-XCa alloys were characterized by OM, XRD and SEM Methods The effect of alloying element Ca on the microstructure of AZ91 magnesium alloy was studied. The results show that the main phase of the alloy consists of matrix Mg, β (Mg17Al12) and Al2Ca. With the increase of Ca content, β (Mg17Al12) phase changed from discontinuous reticular to fine strip, and at the same time Al2Ca phase was formed. With the increase of Ca content, Al2Ca phase increased. When the Ca content reaches 1.25%, the grain refinement is the most obvious, and the mechanical properties reach the best. The tensile strength of the alloy reaches 150MPa at room temperature and the reduction of area is 22.8%.