回火温度对Cu-Al-Mn合金阻尼性能的影响  

Effect of Tempering Temperature on Damping Properties of Cu-Al-Mn Alloy

作　　者：苏雷[1] 李宁[1] 焦玉琴[1] 何加强[1] 文玉华[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065

出　　处：《热加工工艺》2008年第14期22-24,27,共4页Hot Working Technology

基　　金：高等学校博士学科点专项科研基金资助项目(20030610093)

摘　　要：通过倒扭摆仪、微观组织观察等方法研究了不同回火温度下Cu-18Al-10Mn(at%)合金的微观组织对阻尼性能的影响。结果表明,随回火温度升高合金的对数衰减率(δ)逐渐升高,当回火温度达150℃时,δ达到最大值,其原因是回火使过饱和淬火空位浓度降低,对母相的钉扎作用减弱,有利于母相向马氏体相转变,导致合金晶粒内热弹性马氏体数量增多;继续升高温度到200℃,由于新相生成并对马氏体的钉扎,导致合金的对数衰减率下降。The influences of microstructure at different tempering temperature on the damping properties of Cu-18Al-10Mn （at%） alloy were studied by means of optical microscopy observation and reversal torsion method, The results show that the logarithmic decrement rate increases with the increase of tempering temperature, the logarithmic decrement rate reaches maximum at 150 ℃. The reason is that the tempering treatment makes the concentration of supersaturated quenched-in vacancies decrease, and its pining to parent phases weakens, which leads to the volume tiaetion of martensitic increasing. Then the logarithmic decrement rate decreases with tempering temperature increasing to 200 ℃ because the movement of martensitic interfaces is restricted by the precipitates.

关 键 词：CU-AL-MN合金 阻尼性能 对数衰减率 空位 

分 类 号：TG146.11[一般工业技术—材料科学与工程]