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通过重力铸造制备了Mg-2.2Nd-x Sr-0.3Zr(x=0、0.4、0.7、2.0,质量分数,%)合金。采用光学显微镜、扫描电子显微镜观察了铸态合金的显微组织,用显微硬度计测试了合金的硬度,用拉伸试验机测试了合金在室温下的拉伸性能。结果表明,随着Sr含量的增加,组织细化,第二相含量增加,硬度逐渐提高;合金的抗拉强度和伸长率先降低后升高,当合金的抗拉强度和伸长率较高时,呈现为准解理断口,反之,则为沿晶和解理的混合断口。
The alloy Mg-2.2Nd-x Sr-0.3Zr (x = 0,0.4,0.7,2.0, mass fraction,%) was prepared by gravity casting. The microstructure of cast alloy was observed by optical microscope and scanning electron microscope. The hardness of the alloy was measured by microhardness tester. The tensile properties of the alloy at room temperature were tested by tensile tester. The results show that with the increase of Sr content, the microstructure is refined and the content of the second phase increases and the hardness increases gradually. The tensile strength and elongation of the alloy first decrease and then increase. When the tensile strength and elongation of the alloy are higher, Showing quasi-cleavage fracture, on the contrary, it is along the crystal and cleavage of the mixed fracture.