摘要
以AZ31镁合金为基础,通过加入稀土元素Sm(钐)进行合金化,以获得室温和高温力学性能优良的耐热镁合金。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,较为系统地研究了稀土元素Sm对AZ31镁合金显微组织及室温和高温力学性能的影响。结果表明,适量的稀土元素Sm的加入能够改善AZ31镁合金的显微组织,提高其力学性能。随着钐含量的增加,合金的强度和伸长率先升高后降低,且当w(Sm)=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取得最大值。在稀土元素Sm的加入量一定时,合金的抗拉强度随温度的升高而降低。
The alloying was made by the addition of rare earth element Sm on the basis ofAZ31 magnesium alloy in order to develop heat resistant magnesium alloy with excellent me-chanical properties at room temperature and high temperatures. The effects of the rare earthelement Sm on the microstructure and mechanical properties of AZ31 magnesium alloy atroom temperature and high temperatures were studied systematically by optical microscope,scanning electron microscope, X-ray diffraction, and electronic tensile test system. The resultsshow that adding appropriate amount of rare earth Sm could refine microstructure of AZ31magnesium alloy and improve its mechanical properties. With the increase of Sm content, thetensile strength and elongation of the alloy increase at first and then decrease. The peaks oftensile strength and elongation appear when the Sm content is 1.5% no matter at 20℃,150℃, or 175 ℃. When the addition of rare earth Sm is constant, the tensile strength of thealloy decreases with the temperature.
出处
《轻合金加工技术》
CAS
北大核心
2017年第11期57-62,67,共7页
Light Alloy Fabrication Technology
基金
天津自然科学基金项目(2015A03013207)
