摘要
采用光学显微镜、扫描电镜、动态热分析仪和X射线衍射仪研究了固溶时效处理对Mg-4Zn-0.3Zr合金显微组织和阻尼性能的影响。结果表明,铸态合金晶粒尺寸约121μm,晶界粗大且有MgZn、MgZn_(2)和Mg_(7)Zn_(3)相分布;固溶处理后,晶界处的MgZn、MgZn_(2)和Mg_(7)Zn_(3)相基本溶入基体;时效处理后,晶界处有少量的颗粒状MgZn和MgZn_(2)相析出。在低应变振幅区,铸态合金阻尼性能最好,在高应变振幅区,固溶态阻尼性能最好,固溶+时效态合金阻尼曲线的斜率最大;3种状态合金在低温区的阻尼峰均由晶界阻尼峰和位错阻尼峰叠加构成,固溶态和固溶+时效态合金在高温区的阻尼峰为弛豫型阻尼峰。
Effect of solution and aging treatment on microstructure and damping properties of Mg-4Zn-0.3Zr magnesium alloy was studied by means of optical microscope,scanning electron microscope,dynamic mechanical thermal analyzer and X-ray diffractor.The results show that grain size of the as-cast alloy is about 121 μm,the grain boundary is thick and distributed with MgZn,MgZn_(2) and Mg_7Zn_(3) phases.After solution treatment,MgZn,MgZn_(2) and Mg_7Zn_(3) phases on grain boundaries are basically dissolved into the matrix.After aging,a small amount of granular MgZn and MgZn_(2) phases are precipitated on grain boundaries.In the low strain amplitude region,the damping properties of the as-cast alloy is the best,however,in the high strain amplitude region,the damping properties of solution treated alloy is the best,moreover,the slope of the damping curves of the solution treated + aged alloy is the largest.The damping peaks of the alloys with three states in the low temperature region are the superposition of grain boundary damping peaks and dislocation damping peaks.The damping peaks in the high temperature region of the solution treated and solution treated + aged alloy are relaxation damping peaks.
作者
朱嘉欣
孙有平
陈少机
谢尚恒
周勇
Zhu Jiaxin;Sun Youping;Chen Shaoji;Xie Shangheng;Zhou Yong(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou Guangxi 545006,China;Guangxi Earthmoving Machinery Collaborative Innovation Center,Liuzhou Guangxi 545006,China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology,Liuzhou Guangxi 545006,China;Liuzhou Plant,United Automotive Electronic Systems Co.,Ltd.,Liuzhou Guangxi 545006,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第7期97-102,共6页
Heat Treatment of Metals
基金
广西高等学校高水平创新团队项目(桂教师范[2019]52号)
柳州市科技计划(2021CBA0102)
广西研究生教育创新计划(YCSW2021323)。
