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采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计和电子万能实验机等研究了Li含量及固溶处理对Mg-Zn-Y-Mn-(Li)镁合金微观组织和力学性能的影响。结果表明:铸态Mg-Zn-Y-Mn-Li合金主要由α-Mg、鱼骨状W相和块状18R LPSO相组成;适量Li的加入能显著细化合金的晶粒,促进LPSO相的形成,抑制W相的产生;当加入0.5 at%Li时,合金的微观组织和力学性能最优,平均晶粒尺寸由41.66μm减小到25.99μm,LPSO相由8.2%提高到23.1%,W相由23.2%降低到7.0%,屈服强度为135 MPa,抗拉强度为257 MPa,伸长率为8.7%;随后对优化得到的合金进行了固溶处理,发现固溶处理可使合金中鱼骨状W相转变为球状W相,18R LPSO相与部分W相溶解并在基体内部形成层片状的14H LPSO相;随固溶处理时间的增加,合金的屈服强度、抗拉强度和伸长率先升高后降低;固溶处理40 h后,合金的力学性能最优,屈服强度为166 MPa,抗拉强度为267 MPa,伸长率为11.7%。
Abstract：Effect of Li content and solution treatment on microstructure and mechanical properties of Mg-Zn-Y-Mn-(Li) magnesium alloy was studied by means of optical microscope( OM), scanning electron microscopy( SEM), energy dispersive spectrometer( EDS)analysis, X-ray diffraction( XRD), microhardness tester and electronic universal testing machine. The results show that the as cast Mg-Zn-Y-Mn-(Li) alloy is mainly composed of α-Mg, fishbone-like W phase and block 18R LPSO phase. The addition of appropriate amount of Li can significantly refine the grain size of the alloy, promote the formation of LPSO phase and inhibit the formation of W phase.When 0. 5 at% Li is added, the microstructure and mechanical properties of the alloy are the best, the average grain size decreases from 41. 66 μm to 25. 99 μm, the content of LPSO phase increases from 8. 2% to 23. 1%, the content of W phase decreases from 23. 2% to 7. 0%, the yield strength is 135 MPa, the tensile strength is 257 MPa, and the elongation is 8. 7%. Subsequently, the optimized alloy was treated by solution treatment. It is found that the fishbone-like W phase in the alloy is transformed into spherical W phase, and the 18R LPSO phase dissolved with part of W phase and form lamellar 14H LPSO phase in the matrix. With the increase of solution treatment time, the yield strength, tensile strength and elongation of the alloy first increase and then decrease. After solution treatment at 500 ℃ for 40 h, the mechanical properties of the alloy are the best, with the yield strength of 166 MPa, the tensile strength of 267 MPa and the elongation of 11. 7%.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2025-0207
中图分类号:TG146.22;TG156.94
引用信息:
[1]郝建强,武晓东,任兴远等.Li含量及固溶处理对Mg-Zn-Y-Mn-(Li)镁合金显微组织和力学性能的影响[J].材料热处理学报,2025,46(09):45-53.DOI:10.13289/j.issn.1009-6264.2025-0207.
基金信息:
山西省高等学校科技创新项目(2020L0581); 山西省基础研究计划项目(20210302124424); 国家自然科学基金(51574175,51474153)