中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 10 October 2010 |
（1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
2. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
3. Institute of System Engineering, China Academy of Engineering Physics, Mianyang 621900, China）
Abstract: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.
Key words: Mg-Cu-Mn alloy; Y; Zn; magnesium alloys; damping capacity; Granato-Lücke theory
