时效温度对轧制Mg-Al-Ca-Mn-Zn合金组织及阻尼性能的影响  

Effect of aging temperature on microstructure and damping properties of rolled Mg-Al-Ca-Mn-Zn alloy

作　　者：裴梦雨 孙有平[1,2,3] 何江美 刘华燊[1] 刘鑫雨 Pei Mengyu;Sun Youping;He Jangmei;Liu Huashen;Liu Xinyu(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)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545006 [2]广西土方机械协同创新中心,广西柳州545006 [3]广西汽车零部件与整车技术重点实验室,广西柳州545006

出　　处：《金属热处理》2024年第11期246-255,共10页Heat Treatment of Metals

基　　金：广西重点研发计划(桂科AB23026104)。

摘　　要：采用光学显微镜(OM)、动态热分析仪、X射线衍射仪(XRD)、拉伸试验机以及扫描电镜(SEM)等设备,研究了时效处理对多道次轧制+退火处理Mg-1.2Al-0.4Ca-0.3Mn-0.3Zn镁合金板材的显微组织、力学性能以及阻尼性能的影响。结果表明,退火态的平均晶粒尺寸为4.82μm,存在少量孪晶,抗拉强度和伸长率分别为212.09 MPa和9.87%;时效温度为150℃时,平均晶粒尺寸为4.95μm,抗拉强度为207.84 MPa,伸长率为6.58%;时效温度为190℃时,平均晶粒尺寸为4.05μm,晶粒细小且分布均匀,合金晶界处中出现Al-Mn、Al-Ca以及Mg_(2)Ca等第二相,使得综合力学性能良好,抗拉强度为224.21 MPa,伸长率为14.2%。在低应变振幅区(ε≤0.1%),轧制态、退火态、150℃和190℃时效态合金的阻尼值差别不大,在高应变振幅区(ε>0.1%),190℃时效合金的阻尼性能最好;在低温区(35~150℃),4种状态合金的阻尼峰均由位错滑移引起;在高温区(150~375℃),轧制态合金的阻尼峰最高,轧制态、退火态和150℃时效态合金的阻尼峰由位错滑移引起,190℃时效态合金的阻尼峰由位错滑移和晶界滑移叠加得到。Effect of aging treatment on microstructure,mechanical properties and damping properties of Mg-1.2Al-0.4Ca-0.3Mn-0.3Zn magnesium alloy plates after multi-pass rolling+annealing was investigated by means of optical microscope(OM),dynamic thermal analyzer,X-ray diffractor(XRD),tensile testing machine and scanning electron microscope(SEM).The results show that the average grain size of the annealed alloy is 4.82μm with a small amount of twin,and the tensile strength and elongation are 212.09 MPa and 9.87%,respectively.When the aging temperature is 150℃,the average grain size is 4.95μm,the tensile strength is 207.84 MPa,and the elongation is 6.58%.When the aging temperature is 190℃,the average grain size is 4.05μm,the grains are fine and uniformly distributed and the second phases such as Al-Mn,Al-Ca and Mg_(2)Ca appear at the grain boundaries of the alloy,which results in good mechanical properties,with tensile strength of 224.21 MPa and elongation of 14.2%.In the low strain amplitude region(ε≤0.1%),the damping values of the alloy rolled,annealed,150℃aged and 190℃aged are not significantly different.While,in the high strain amplitude region(ε>0.1%),the damping properties of the 190℃aged alloy is the best.In the low-temperature range of 35-150℃,the damping peaks of the alloy in four states are all caused by dislocation slip,but in the high temperature range of 150-375℃,the damping peak of the rolled state alloy is the highest,and the damping peaks of the rolled,annealed and 150℃aged alloys are caused by dislocation slip,and the damping peak of the 190℃aged alloy is obtained by the superposition of the dislocation slip and the sliding of the grain boundary.

关 键 词：时效温度 显微组织 阻尼性能 Mg-Al-Ca-Mn-Zn合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]