【摘要】 提出了TiNi形状记忆合金线性回复行为的新概念 ,采用稀土表面渗入化学热处理的方法 ,研究了对其线性回复性能的影响。实验结果表明 :对TiNi形状记忆合金弹簧渗铈 (Ce)或渗钐 (Sm) ,可以显著改善其线性回复性能。线性回复温度范围TW 从 4℃拓宽到 11℃ ,线性回复率 η从 5 4 %提高到 78% ,线性回复程度PL 从 5 6 %提高到 70 % ,非线性回复程度PS 从 4 4 %减小至 8% ,但总回复程度PT 有所下降。这些结果是由于TiNi合金弹簧渗层中金属间化合物的强化效果所致更多还原

【Abstract】 A new concept of linear recovery behavior in TiNi shape memory alloy (SMA) has been proposed.The effect of rare-earth chemical heat treatment on its linear recovery properties was investigated.The results indicate that ceriuming or samarieuming can modify obviously the linear recovery properties of TiNi SMA spring.The temperature range of the linear reversion (T W) was enlarged from 4℃ to 11℃.The ratio of linear reversion (η) was increased from 54% to 78%,the proportion of linear reversion (P L) was increased from 56% to 70%,and the proportion of non-linear reversion (P S) was decreased from 44% to 8%,but the proportion of total reversion (P T) have a little decrease.These results were attributed to the strengthening effect of intermetallics.更多还原