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粉末冶金方法可成功地制取 Cu-14Al-4Ni(wt%)形状记忆合金。热循环使得粉末冶金法制得的 Cu-14Al-4Ni 形状记忆合金热弹性马氏体相变温度升高,最后趋于稳定。淬火速率越大,热循环过程中热弹性马氏体相变的稳定性越差。同样的淬火速率,热循环上限温度越高,随热循环次数增加相变温度变化越大。粉末冶金方法制取的本合金经空冷后有较好的热循环稳定性。本文提出了用应力弛豫假说来解释热循环对马氏体相变温度的影响。
Powder metallurgy method can be successfully prepared Cu-14Al-4Ni (wt%) shape memory alloy. The thermal cycling results in the increase of the thermoelastic martensitic transformation temperature of the Cu-14Al-4Ni shape memory alloy obtained by the powder metallurgy method and finally stabilizes. The greater the quenching rate, the worse the thermal stability of the thermoelastic martensitic transformation during thermal cycling. The same quenching rate, the higher the upper limit of the thermal cycle temperature, with the increase of the number of thermal cycles phase transition temperature greater. The powder metallurgy method prepared by the alloy after air cooling has better thermal cycling stability. This paper presents the use of stress relaxation hypothesis to explain the effect of thermal cycling on martensitic transformation temperature.