Effects of cold working and heat treatment on transformation temperature of Ti-41.7Ni-8.5Cu (at%) shape memory alloy and its probabilistic prediction

Materials Science Research International Pub Date : 1900-01-01 DOI:10.2472/jsms.52.6Appendix_167

M. Hosogi, N. Okabe, T. Sakuma, S. Miyazaki

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Abstract

The transformation temperatures of shape memory alloy vary with the composition and processing and manufacturing conditions of the alloy. The purpose of the present study is to clarify the effects of cold working and heat treatment on various transformation temperatures, and to estimate probabilistically the transformation temperatures by means of a model. The shape memory alloy used was Ti-41.7Ni-8.5Cu (at%), and the transformation temperatures were measured by the differential scanning calorimeter method (DSC method). The effects of processing and heat treatment on the transformation temperatures were investigated by changing the cold working ratio (10-40 %) and the heat treatment temperature (623-773 K), respectively. As a result, the transformation temperatures were found to decrease with increasing cold working ratio. The transformation temperatures were also found to increase with increasing heat treatment temperature. Therefore, the transformation temperatures were modeled by considering quantitatively the effects of the cold working ratio and the heat treatment temperature. A probabilistic prediction formula was proposed so that the reliability of the prediction may be estimated quantitatively.

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冷加工和热处理对Ti-41.7Ni-8.5Cu (at%)形状记忆合金相变温度的影响及其概率预测

形状记忆合金的相变温度随合金成分和加工制造条件的不同而变化。本研究的目的是阐明冷加工和热处理对不同转变温度的影响，并利用模型对转变温度进行概率估计。形状记忆合金为Ti-41.7Ni-8.5Cu (at%)，相变温度采用差示扫描量热法(DSC法)测定。通过改变冷加工比(10 ~ 40%)和热处理温度(623 ~ 773 K)，研究了加工和热处理对相变温度的影响。结果表明，随着冷加工比的增大，相变温度逐渐降低。相变温度随热处理温度的升高而升高。因此，定量考虑了冷加工比和热处理温度的影响，建立了相变温度模型。提出了一个概率预测公式，以便定量估计预测的可靠性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Materials Science Research International

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