采用粉末冶金法制备了Mg-x％ Zr阻尼合金(x=0.6,1.5,2.5,5,质量分数,下同),通过三点弯曲测试和DMA技术等手段研究了Zr含量对Mg-Zr合金的组织、力学性能和阻尼性能的影响.结果表明,随着Zr含量增加,组织演变为条带状结构,同时在晶界及晶内出现点状颗粒,晶粒更加细化.Mg-x％ Zr阻尼合金的致密度、硬度、抗弯强度随着Zr含量增加而提高,Zr含量为2.5％的合金的致密度、抗弯强度和显微硬度达到最大值.在频率5Hz,应变振幅6×10-5的测试条件下,Mg-5％ Zr合金的阻尼性能最好,阻尼值tanΦ达到0.084,Mg-1.5％ Zr次之,Mg-2.5％ Zr合金的阻尼性能最差.在27～100℃的温度范围内,Mg-x％ Zr合金阻尼性能随温度升高而缓慢提高,在高于100℃后,合金阻尼性能随温度的升高迅速增加,并在160℃出现阻尼峰.Mg-1.5％ Zr合金的阻尼峰温度随频率增大而升高,呈现出弛豫型阻尼特征.
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