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首页> 外文会议>AD-vol.69; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20041113-19; Anaheim,CA(US) >EFFECT OF MECAHNICAL AND THERMAL CYCLING ON SHAPE MEMORY PROPERTIES OF HIGH TEMPERATURE Cu-Al-Ni SINGLE CRYSTALS
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EFFECT OF MECAHNICAL AND THERMAL CYCLING ON SHAPE MEMORY PROPERTIES OF HIGH TEMPERATURE Cu-Al-Ni SINGLE CRYSTALS

机译：机械和热循环对高温Cu-Al-Ni单晶晶体形状记忆特性的影响

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摘要

With a view towards applications as actuators, the effect of mechanical cycling followed by thermal cycling on 1.5 mm diameter Cu-13.3%Al-4%Ni (by weight) single crystal wires with high stress-free transformation temperatures: M_f =96℃, M_s = 105.5?, A_s= 111.6℃ and A_f = 115.8℃ (determined by the method of tangents) have been studied at different ambient temperatures in the range 25-125℃. The tests are carried out in an Instron machine with an environmental chamber. Stress cycling at a given ambient temperature was carried out for an overall strain of 9% until the stress-strain curves became fairly repeatable. A total of 35 stress cycles were needed to span the ambient temperature range, 25-125℃. The material showed an excellent retention of the shape memory effect in the range of 25-100℃ (this is below the A_f =115.8℃ of the as-received sample), excellent pseudoelasticity at 125℃, and no irreversible plastic deformation. A net downward shift of transformation temperatures by about 5℃ did occur over the first 11 cycles. This was followed by a reversal of the downward shift and the transformation temperatures stabilized by the 35th cycle close to those of the as-received sample. The stabilized temperatures were: M_f =95?, M_s = 106.5℃, A_s = 110℃ and A_f = 118.5℃ (method of tangents). However, the transformation occurred over a wider temperature range as compared to that of the as-received sample, especially during the austenite to martensite transformation on cooling. These features point to the possibility of the Cu-13.3%Al-4%Ni single crystal as a highly competitive candidate for actuator applications.
机译：考虑到作为致动器的应用，机械循环接着热循环对具有高无应力转变温度的1.5 mm直径Cu-13.3％Al-4％Ni（按重量计）单晶线的影响：M_f = 96℃，在25-125℃的不同环境温度下，研究了M_s =105.5？，A_s = 111.6℃和A_f = 115.8℃（通过切线法确定）。测试是在带有环境箱的Instron机器中进行的。在给定的环境温度下进行总应力为9％的应力循环，直到应力-应变曲线变得相当可重复为止。整个环境温度范围（25-125℃）总共需要35个应力循环。该材料在25-100℃的范围内具有优异的形状记忆效果（低于所接收样品的A_f = 115.8℃），在125℃时具有出色的拟弹性，并且不会发生不可逆的塑性变形。在前11个循环中确实发生了约5℃的转变温度的净下降。随后是向下移位的逆转，并且通过第35个循环稳定的转变温度接近了接收样品的温度。稳定温度为：M_f ＝ 95℃，M_s ＝ 106.5℃，A_s ＝ 110℃，A_f ＝ 118.5℃（切线法）。但是，与原样相比，相变发生在更宽的温度范围内，尤其是在冷却时奥氏体向马氏体相变的过程中。这些特征表明，Cu-13.3％Al-4％Ni单晶有可能成为执行器应用中极具竞争力的候选材料。

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