稀土Sm对5086铝合金组织和性能的影响

Effect of Sm on the Microstructure and Mechanical Properties of 5086 Aluminum Alloy

以5086合金为基础,通过加入稀土元素Sm进行合金化,以期获得室温和高温力学性能优良的耐热铝合金。采用光学显微镜、扫描电镜、X射线衍射仪、电子拉伸试验机等多种分析和测试手段,系统研究了稀土元素Sm对5086合金显微组织及室温和高温力学性能的影响。结果表明,适量稀土元素Sm的加入能够改善5086合金的显微组织,提高其力学性能。随着Sm含量的增加,合金的强度和伸长率先升高后降低,且当Sm的加入量为1.5%时,不论是在室温(20℃),还是在高温(150℃、175℃),合金的抗拉强度和伸长率都能取得最大值。

In this paper,the alloying was made by the addition of rare earth element Sm on the base of 5086 alloy in order to develop heat resistant magnesium alloy with excellent mechanical properties at room temperature and high temperature.The effects of the rare earth element Sm on the microstructure and mechanical properties of 5086 alloy at room temperature and high temperature were studied systemically by optical microscope,scanning electron microscope,X-ray diffraction,and electronic tensile test system.The results show that adding appropriate amount of rare earth Sm could refine the microstructure of 5086 alloy,and improve its mechanical properties.With the increase of Sm content,the tensile strength and elongation of the alloy increase at first,and then decrease.And when Sm content is 1.5%,at room temperature(20℃)and at higher temperature(150℃,175℃),the peaks of tensile strength and elongation appear.