Nd含量对Mg-6Gd-2.5Y-0.5Zr合金显微组织和力学性能的影响

发布时间：2018-01-28 11:09

本文关键词： Nd元素镁合金显微组织力学性能　出处：《中国有色金属学报》2017年09期 　论文类型：期刊论文

【摘要】：通过金相观察、X射线衍射、透射电镜、硬度测试和拉伸性能测试等实验方法,研究添加不同含量的Nd元素对Mg-6Gd-2.5Y-0.5Zr合金的显微组织、时效硬化行为以及峰值时效下力学性能的影响。结果表明:随着Nd含量的增加,铸态合金中第二相Mg_5(Gd/Y)和Mg_(24)(Gd/Y)_5的含量显著增加,合金经固溶淬火后,时效强化现象越来越显著,峰值时效时间缩短,峰值时效硬度明显增加。当Nd元素的含量为1.0%(质量分数),合金的力学性能最佳,Mg-6Gd-2.5Y-1Nd-0.5Zr的抗拉强度为289 MPa,屈服强度为241 MPa。时效硬化行为和峰值时效力学性能得到改善,其主要是因为加入Nd元素后,在α-Mg基体中形成大量的β′相,且β′相明显细化,β′相的形貌也发生改变。
[Abstract]:X-ray diffraction (XRD), transmission electron microscopy (TEM), hardness test and tensile test were used. The microstructure of Mg-6Gd-2.5Y-0.5Zr alloy with different content of ND was studied. The effect of aging hardening behavior and mechanical properties under peak aging conditions. The results show that: with the increase of ND content. The second phase Mg5Gd / Y) and Mg_(24)(Gd/Y)_5 contents in as-cast alloys increased significantly, and the aging hardening phenomenon became more and more obvious after solution quenching. The peak aging time is shortened and the peak aging hardness is obviously increased. When the content of ND element is 1.0 (mass fraction), the mechanical properties of the alloy are the best. The tensile strength and yield strength of Mg-6Gd-2.5Y-1Nd-0.5Zr were 289MPa and 241MPa respectively. The aging hardening behavior and the mechanical properties of peak aging were improved. The main reason is that after the addition of ND, a large number of 尾 'phases are formed in 伪 -Mg matrix, and the 尾' phase is refined obviously, and the morphology of 尾 'phase also changes.
【作者单位】：中南大学材料科学与工程学院;中南大学有色金属先进结构材料与制造协同创新中心;中南大学轻合金研究院;
【基金】：国家重点研发项目(2016YFB0300901) 国家自然科学基金资助项目(51375503) 广西八桂学者资助项目(2013A017)~~
【分类号】：TG146.22
【正文快照】： 3.中南大学有色金属先进结构材料与制造协同创新中心,长沙410083)镁合金以其密度低、比强度和比刚度高、导热性好、电磁屏蔽效果佳等优点,被广泛地应用于航天航空、汽车、计算机、电子、通讯等各个领域,被誉为“21世纪的绿色工程材料”,但纯镁的强度比较低,不能作为结构材料而

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