关键词: Mg-xSn-1Mn合金, Sn含量, 硬度, 显微组织, 阻尼性能

Abstract: 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.

Key words: Mg-xSn-1Mn alloy, Sn content, hardness, microstructure, damping property