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采用传统重力铸造制备Mg-Ni-Y合金并研究了Ni含量对合金显微组织和力学性能的影响。结果表明,Mg-0.5Ni-3.5Y合金组织由α-Mg和Mg24Y5两相组成;Mg-1.2Ni-3.5Y合金中Mg24Y5相消失,形成了层片状长周期堆垛有序(LPSO)相;Mg-1.9Ni-3.5Y和Mg-3.5Ni-3.5Y合金中除含有α-Mg和LPSO相外,在晶界处还存在共晶组织。LPSO相可以提高合金的强度,具有大量细小致密层片状LPSO相的Mg-1.2Ni-3.5Y合金综合力学性能最优,铸态抗拉强度及伸长率可分别达到210 MPa和8.8%。
The Mg-Ni-Y alloy was prepared by traditional gravity casting and the effect of Ni content on the microstructure and mechanical properties of the alloy was studied. The results show that the microstructure of Mg-0.5Ni-3.5Y alloy is composed of two phases, α-Mg and Mg24Y5, and Mg-Mg-Mg-Mg-0.5Ni-3.5Y alloy disappears to form lamellar long period stacking ordered In the Mg-1.9Ni-3.5Y and Mg-3.5Ni-3.5Y alloys, in addition to α-Mg and LPSO phases, there are eutectic structures at grain boundaries. The LPSO phase can improve the strength of the alloy. The Mg-1.2Ni-3.5Y alloy with a large number of fine and compact platelet LPSO phase has the best comprehensive mechanical properties, and the as-cast tensile strength and elongation can reach 210 MPa and 8.8% respectively.