采用金相分析、差示扫描量热分析、循环拉伸及阻尼试验等研究了不同温度(1200~1350℃)淬火后Co39 Ni34 Al27形状记忆合金的显微组织、马氏体相变、超弹性及阻尼性能.结果表明：随着淬火温度的升高,该合金晶粒发生粗化,γ相含量减少,β相逐渐转变为马氏体相；马氏体相变温度与淬火温度几乎成线性正比关系；1250℃淬火后的合金具有明显的超弹性性能；1250,1320℃淬火后的合金在马氏体相变过程中出现阻尼峰值,分别为0．042和0．035,1320℃淬火后合金的阻尼性能略低于1250℃淬火后的.
The microstructure,martensitic transformation,pseudoelasticity and damping properties of the Co39 Ni34 Al27 alloy quenched at different temperatures from 1 200 to 1 350 ℃ were investigated by optical microscopey,differential scanning calorimetry,cyclic tensile test and damping test.The results show that with the increase of quenching temperature,the grain size of the alloy increased,theγphase content decreased and theβphase was gradually transformed into martensite phase.The martensite transformation temperatures were almost linearly proportional to the quenching temperatures.The alloy quenched at 1 250 ℃ showed a significant pseudoelasticity performance.The damping capacity of the alloy after quenching at 1 250 ℃ and 1 320 ℃ reached the peak values during the martensitic transformation,which were 0.042 and 0.035 respectively.The damping capacity of the alloy quenched at 1 320 ℃ was larger than that at 1 250 ℃.
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