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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Temperature memory effect in TiNi-based shape memory alloys
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Temperature memory effect in TiNi-based shape memory alloys

机译：TiNi基形状记忆合金中的温度记忆效应

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摘要

An incomplete thermal cycle upon heating of a shape memory alloy (arrested at a temperature between austenite transformation start and finish temperatures, A(s) and A(f)) induced a kinetic stop in the next complete thermal cycle. The kinetic stop temperature was closely related to the previous arrested temperature. This phenomenon is named temperature memory effect (TME). In this work, the TME induced by incomplete cycling in TiNi and TiNiCu ribbons, TiNiCu thin films and TiNiCu wire showing two-way shape memory effect was systematically investigated by performing either a single incomplete cycle, or a sequence of incomplete cycles with different arrested temperatures. Results showed that the TME is a common phenomenon in shape memory alloys, caused by a partial martensite to parent phase (M -> P) transformation. N points of temperatures could be memorized if N times of incomplete cycles on heating were performed with different arrested temperatures in a decreasing order. On the contrary, if a partial parent phase to martensite (P -> M) transformation was performed by an incomplete cycle on cooling, the next complete P -> M transformation did show any evidence of TME. The incomplete cycle of parent phase to R-phase and R-phase to parent phase transformations did not show any evidence of TME. Results showed that the capability to memorize the temperature is a specific characteristic of the martensitic phase, and the decrease in microstrains and elastic energy after ICH procedure has significant contributions to the TME. (c) 2004 Elsevier B.V. All rights reserved.
机译：加热形状记忆合金时的不完全热循环（停在奥氏体转变开始和结束温度A（s）和A（f）之间的温度）在下一个完全热循环中引起了动力学停止。动态停止温度与先前的停止温度密切相关。这种现象称为温度记忆效应（TME）。在这项工作中，通过执行单个不完整循环或具有不同阻滞温度的不完整循环序列，系统地研究了TiNi和TiNiCu薄带，TiNiCu薄膜和TiNiCu线中表现出双向形状记忆效应的不完全循环引起的TME。 。结果表明，TME是形状记忆合金中的常见现象，是由部分马氏体向母相（M-> P）转变引起的。如果以不同的阻滞温度降序执行N次加热不完全循环，则可以存储N个温度点。相反，如果冷却时不完全循环进行了马氏体相变的部分母体相（P-> M），则下一个完全的P-> M相变确实显示出任何TME迹象。母相到R相的不完全循环以及R相到母相的不完全循环没有显示TME的任何证据。结果表明，记忆温度的能力是马氏体相的一个特定特征，并且ICH程序后微应变和弹性能的降低对TME有重要贡献。 （c）2004 Elsevier B.V.保留所有权利。

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