铸态Mg-xSn-1Mn合金的显微组织和阻尼性能  

Microstructure and damping property of as-cast Mg-xSn-1Mn alloy

作　　者：冯旭辉 孙有平[1] 何江美[1] Feng Xuhui;Sun Youping;He Jiangmei(College of Mechanical Engineering,Guangxi University of Science and Technology,Liuzhou Guangxi 545006,China)

机构地区：[1]广西科技大学机械工程学院,广西柳州545006

出　　处：《金属热处理》2020年第5期29-34,共6页Heat Treatment of Metals

基　　金：广西自然科学基金(2016GXNSFDA380008);柳州市科学研究与技术开发计划(2017BD20301)。

摘　　要：采用光学显微镜(OM)、维氏硬度计、热动态分析仪、X射线衍射(XRD)、多功能内耗仪等,研究了Sn含量对Mg-xSn-1Mn合金显微组织、阻尼性能和力学性能的影响。结果表明:当Sn含量从2%增加到8%时,Mg-xSn-1Mn合金的枝晶间隙呈现细化的趋势,硬度从43.84HV0.1增加至54.00HV0.1,呈单调增加的趋势。应变无关阻尼随着Sn含量的增加呈现先增后减的趋势,在Sn含量为4%时达到最大,应变相关阻尼则随着Sn含量的增加呈现逐渐减小的趋势。在低温阶段,相同Sn含量的合金的阻尼随着频率的增大呈现增加的趋势;但在高温下,阻尼值在低频时的上升速率比高频时快,并随着温度的升高,低频阻尼和高频阻尼趋向于相等。当Sn含量不同时,随着温度的升高,Sn含量较高的合金的阻尼值上升速率变快。Effect of Sn content on the microstructure,damping properties and mechanical properties of Mg-xSn-1Mn alloy were studied by optical metallographic microscope( OM),Vickers hardness tester,thermal dynamic analyzer,X-ray diffraction( XRD) and multifunctional internal consumption meter. The results show that with the Sn content increasing from 2% to 8%,the dendrite clearance of the Mg-xSn-1Mn alloy shows the tendency of refining,and the hardness increases from 43. 84 HV0. 1 to 54. 00 HV0. 1 with tendency of monotonic increasing.The strain independent damping increases first then decreases with the increase of Sn content,and reaches the maximum when the Sn content is 4%. The strain dependent damping decreases with the increase of Sn content. At low temperature,the damping of the alloy with the same Sn content increases as the frequency increases,but at high temperatures,the rise of damping at low frequency is faster than that at high frequency. With the increase of temperatures,the low-frequency damping and the high-frequency damping tend to be equal. When the Sn content is different,with the increase of temperature,the damping value of the alloy with higher Sn content increases faster.

关 键 词：Mg-xSn-1Mn合金 Sn含量 硬度 显微组织 阻尼性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]