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借助光学显微镜、扫描电镜、X射线衍射仪和DNS100电子万能试验机研究AM60合金中加入Sm后的显微组织和力学性能,并分析Sm对合金显微组织和力学性能的影响。结果表明,添加元素Sm可以细化镁合金的晶粒,改变β相的形态和大小,从连续或断续网状、长条状,变为卵石状或颗粒状均匀弥散分布在α-Mg基体上,显著改善合金的显微组织。Sm的加入可形成稳定性较高的颗粒状Al2Sm高温化合物相。随着Sm含量的增加,合金的抗拉伸强度和伸长率呈现先升后降的趋势,当Sm含量为1.0%(质量分数,下同)时抗拉伸强度和伸长率分别达到最大值210MPa和6.9%。室温下AM60合金的断口呈解理断裂,加入Sm变质后其断口形貌表现为准解理+局部韧性断裂特征。
The microstructure and mechanical properties of AM60 alloy were investigated by optical microscope, scanning electron microscopy, X-ray diffraction and DNS100 electronic universal testing machine. The effects of Sm on the microstructure and mechanical properties of the alloy were analyzed. The results show that the addition of Sm can refine the grains of magnesium alloy, change the shape and size of β phase, disperse evenly in α-Mg matrix from continuous or discontinuous reticular, long strip, into pebble or granular On the significant improvement of alloy microstructure. Sm can be added to form a more stable granular Al2Sm high temperature compound phase. With the increase of Sm content, the tensile strength and elongation of the alloy tend to increase first and then decrease. When the Sm content is 1.0% (mass fraction, the same below), the tensile strength and elongation reach the maximum of 210MPa And 6.9% respectively. The fracture of AM60 alloy at room temperature showed cleavage fracture. The morphology of the fracture surface after adding Sm metamorphosis was characterized by quasi-cleavage + local ductile fracture.