Effects of Y and Zn on mechanical properties and damping capacity of Mg-Cu-Mn alloy  

作　　者：王敬丰 魏文文 李龙 梁浩 潘复生 

机构地区：[1]National Engineering Research Center for Magnesium Alloys,Chongqing University [2]College of Materials Science and Engineering,Chongqing University [3]Institute of System Engineering,China Academy of Engineering Physics

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第10期1846-1850,共5页中国有色金属学报（英文版）

基　　金：Project(10876045) supported by the National Natural Science Foundation of China and China Academy of Engineering Physics;Project(2007CB613704) supported by the National Basic Research Program of China;Project(CSTS2008AB4114) supported by Chongqing Science and Technology Commission,China

摘　　要：Optical microscope,X-ray diffractometer,scanning electron microscope,tensile tester and dynamic mechanical analyzer(DMA) were applied to investigate the effects of Y and Zn additions on microstructure,mechanical properties and damping capacity of Mg-3Cu-1Mn(CM31) alloy.The results show that with the increase of Y and Zn contents,the secondary dendrite arm spacing of alloys is reduced;meanwhile,the yield strength is increased.In low strain amplitude,the damping capacity of alloys with Y and Zn addition is lower than that of CM31 alloy.However,in strain amplitude over 5×10-3,the damping capacity of alloy with a trace of Y and Zn addition(1%Y and 2%Zn,mass fraction) increases abnormally with the increase of strain amplitude and is near to that of pure Mg,probably due to the increase of dislocation density caused by the precipitation of secondary phase.The temperature dependence of damping capacity of above alloy was also tested and discussed.Optical microscope,X-ray diffractometer,scanning electron microscope,tensile tester and dynamic mechanical analyzer（DMA） were applied to investigate the effects of Y and Zn additions on microstructure,mechanical properties and damping capacity of Mg-3Cu-1Mn（CM31） alloy.The results show that with the increase of Y and Zn contents,the secondary dendrite arm spacing of alloys is reduced;meanwhile,the yield strength is increased.In low strain amplitude,the damping capacity of alloys with Y and Zn addition is lower than that of CM31 alloy.However,in strain amplitude over 5×10-3,the damping capacity of alloy with a trace of Y and Zn addition（1%Y and 2%Zn,mass fraction） increases abnormally with the increase of strain amplitude and is near to that of pure Mg,probably due to the increase of dislocation density caused by the precipitation of secondary phase.The temperature dependence of damping capacity of above alloy was also tested and discussed.

关 键 词：Mg-Cu-Mn alloy Y ZN magnesium alloys damping capacity Granato-Lucke theory 

分 类 号：TG146.22[一般工业技术—材料科学与工程]