摘要
采用光学显微镜、 X射线衍射仪、扫描电子显微镜、透射电子显微镜、拉伸试验机研究了铸态Mg-xSm-yGd-Zn-Zr (x=3,y=5;x=4,y=4;x=5,y=3(%,质量分数))合金的微观组织和力学性能。铸态合金中存在面心立方结构的(Mg, Zn)_(3)(Sm, Gd)相,a=0.726 nm。三种铸态合金的平均晶粒尺寸分别为46.4±3, 37.7±2和49.8±3μm, Mg-4Sm-4Gd-Zn-Zr晶粒细化效果最好,室温力学性能最佳,屈服强度、抗拉强度和延伸率分别为133, 198 MPa和9.2%,优于相应状态的WE43商用耐热镁合金,在保持合金性能不变的前提下,降低了合金成本。为稀土镁合金中Sm替代Nd,提供了事实和理论依据。
The microstructures and tensile properties of as-cast Mg-xSm-yGd-Zn-Zr(x=3,y=5;x=4, y=4;x=5, y=3 wt.%)alloys were investigated by means of optical microscopy(OM), X-ray diffractometer(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and tensile tests. The intermetallic compound(Mg, Zn)_(3)(Sm, Gd)(FCC, a=0.726 nm) could be observed in all the as-cast alloys. The diameters of the as-cast alloys were 46.4±3.0, 37.7±2.0 and 49.8±3.0 μm, respectively. The Mg-4 Sm-4 Gd-Zn-Zr alloy had the finest grains and best tensile properties with yield strength, tensile strength and elongation of 133, 198 MPa and 9.2%. The mechanical properties of Mg-4 Sm-4 Gd-Zn-Zr alloy were superior to those of WE43 alloy, and the cost of the former was lower than that of the latter. Therefore, the method of substituting Sm for Nd is of significance to reduce the cost and improve the strength in Mg-RE alloys.
作者
秦成
车朝杰
程丽任
邓瑞平
张洪杰
吴芳芳
潘伟建
Qin Cheng;Che Chaojie;Cheng Liren;Deng Ruiping;Zhang Hongjie;Wu Fangfang;Pan Weijian(State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;Titanium Alloy Research Center,Northwest Institute for Non-ferrous Metal Research,Xi'an 710000,China;Engineering Research Center of Heavy Machinery,Ministry of Education,Taiyuan University of Science and Technology,Taiyuan 030024,China;Zhejiang Key Laboratory for Protection Technology of High-Rise Operation,Zhejiang Huadian Equipment Testing Institute Co.Ltd.,Hangzhou 310015,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2021年第3期523-530,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金青年项目(51901149)
山西省应用基础研究计划面上青年基金项目(201901D211307)资助。
