【摘要】 本文提出了形状记忆合金线性回复行为的新概念 ,并对线性回复性能指标进行了具体定义。通过测试TiNi形状记忆合金弹簧的热回复曲线 ,研究了经过不同热处理工艺TiNi形状记忆合金的线性回复特性。结果表明 :通过适当的热处理工艺手段 ,可以显著改善TiNi形状记忆合金的线性回复性能 ,最佳的热处理工艺为5 5 0℃空冷 ,它将线性回复程度PL从 5 6%提高至 92 % ;线性回复率η从 5 4%提高到 83 % ;线性温度范围TW从 4℃拓宽为 6℃。更多还原

【Abstract】 A new concept of linear recovery behavior in TiNi shape memory alloy ( SMA) has been proposed, and its property index has been defined. Through testing the heat reversion curves we study the TiNi SMA spring’s linear reversion effec t under different heat treatments. The results indicated that the proper heat tr eatment technology can modify obviously the linear recovery properties of TiNi S MA spring. The optimal heat treatment technology is 550 oC + AC: the proportion of linear reversion (PL) was increased from 56% to 92%, the ratio of linear reve rsion () was increased from 54% to 83%, and the temperature range of the linear reversion (TW) was enlarged from 4 oC to 6 oC.更多还原