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研究了时效时间对Fe 1 4Mn 5Si 8Cr 4Ni 0 2C记忆合金显微组织、形状记忆效应和电阻率的影响。结果表明 ,在 1 1 2 3K时效时 ,合金的形状回复率随时效时间的增加而升高 ,在 30 0min时达到最大值 ,比固溶态提高了 96% ;随后形状回复率随时效时间的进一步增加而缓慢下降。当时效时间小于 30min时 ,将降低合金的电阻率。当时效时间大于 30min后 ,合金的电阻率随时间的增加而升高 ,在 1 80min时达到最大。当时效时间大于 1 80min后 ,时间的进一步增加将降低合金的电阻率。电阻率的变化反映了第二相粒子析出的情况。能谱和波谱分析表明时效析出的第二相是富铬、富锰和富硅的 (Fe,Mn ,Si,Cr) 3C合金渗碳体 ,其数量随时效时间的增加而增加 ,且粒子长大。通过时效强化奥氏体基体 ,可显著提高合金的形状记忆效应。
The effect of aging time on the microstructure, shape memory effect and resistivity of Fe 1 4Mn 5Si 8Cr 4Ni 0 2C memory alloy was studied. The results show that the shape recovery of the alloy increases with the aging time at 1 1 2 3K, reaching the maximum at 30 0min, which is 96% higher than that of the solid solution. The shape recovery rate of the alloy increases with the aging time Further increase and decline slowly. When the aging time is less than 30min, will reduce the resistivity of the alloy. When the aging time is greater than 30min, the resistivity of the alloy increases with time, reaching the maximum at 180min. When the aging time is more than 180min, the further increase of the time will reduce the resistivity of the alloy. The change in resistivity reflects the precipitation of second phase particles. EDS and EDS analysis showed that the second phases precipitated during aging are the (Fe, Mn, Si, Cr) 3C-rich cementite which is rich in chromium, manganese and silicon. The amount of cementite increases with the aging time, Big. By aging strengthened austenite matrix, can significantly improve the shape memory effect of the alloy.