混合稀土对超轻Mg-Li合金微观组织和力学性能的影响（英文）

发布时间：2018-01-16 00:19

本文关键词：混合稀土对超轻Mg-Li合金微观组织和力学性能的影响（英文）　出处：《稀有金属材料与工程》2017年07期 　论文类型：期刊论文

【摘要】：对La/Ce混合稀土的Mg-9Li-3Al-xRE(x=0,0.5,1,1.5,2,质量分数,%)合金,利用光学显微镜,带能谱(EDS)的扫描电子显微镜(SEM)和X射线衍射(XRD)研究了微观组织对其力学性能的影响。结果表明,在加入混合稀土的铸态合金中,形成了Al_4RE相,并且Mg_(17)Al_(12)相的含量和α-Mg相的体积分数均被减少。此外,细化了α-Mg相并提高了合金的力学性能。但是,随着La/Ce混合稀土含量的增加,Al_4RE相的尺寸增大,降低了合金的力学性能。在加入混合稀土的挤压态合金中,合金中Al_4RE相挤压破碎至1~3μm,分布于β-Li基体中和α/β相之间。Mg-9Li-3Al-1.5RE合金获得最好的力学性能,最大抗拉强度和延伸率分别为228.3 MPa和20.8%,同铸态Mg-9Li-3Al相比分别提高了88.6%和197.4%。
[Abstract]:The Mg-9Li-3Al-xREXOXY (0. 5%) alloy of La/Ce mixed rare earth elements is studied by optical microscope. The effect of microstructure on the mechanical properties of as-cast alloys with mixed rare earths was investigated by scanning electron microscopy (SEM) with EDS) and X-ray diffraction (XRD). The Al_4RE phase was formed, and the content and volume fraction of 伪 -Mg phase were decreased. The 伪 -Mg phase was refined and the mechanical properties of the alloy were improved. However, with the increase of the content of La/Ce mixed rare earth, the size of AlSn4RE phase increased. The mechanical properties of the alloy were reduced. In the extruded alloy with mixed rare earth, the Al_4RE phase in the alloy was extruded and broken to 1 ~ 3 渭 m. The best mechanical properties were obtained in 尾 -Li matrix and between 伪 / 尾 phase. Mg-9Li-3Al-1.5RE alloy. The maximum tensile strength and elongation were 228.3 MPa and 20.8, respectively, which were increased by 88.6% and 197.4 compared with the as-cast Mg-9Li-3Al, respectively.
【作者单位】：重庆大学材料科学与工程学院;国家镁合金材料工程技术研究中心;上汽依维柯红岩商用车有限公司;
【基金】：Fundamental Research Funds for the Central Universities(CDJZR14130007,106112015CDJXY130011)
【分类号】：TG146.21
【正文快照】： Mg-Li alloy is one of the lightest metallic structuralapproach actively being studied and implemented.Thematerials[1-3].According to the Mg-Li binary phase diagram,frequently used alloying elements include aluminum,zinc,Mg-Li alloy possessesα-Mg(hcp)+β

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