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首页> 外文会议>International Conference on Shape Memory and Superelastic Technologies >Shape Memory Effect in Aging of Ni-Ti Shape Memory Alloy Wire Bent in V-Shape at Room Temperature
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Shape Memory Effect in Aging of Ni-Ti Shape Memory Alloy Wire Bent in V-Shape at Room Temperature

机译：在室温下V形弯曲型镍钛形记忆合金线老化时的形状记忆效应

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摘要

Ni-Ti shape memory alloys have versatile characteristics in shape memory effect and superelasticity depending on the application temperature related to their transformation temperature between martensitic and austenitic phases [1]. To show their shape memory effect, their martensitic phase should be at the working temperature. A noticeable deformation, which appears in the alloys due to the application of a load and remains even after the removal of the load, can vanish only by raising the temperature beyond the austenitic transformation point of the alloys. The conventional process to form alloys into shapes and have them possess shape memory effect is to form the alloys with a pair of dies in hot state, keep the alloys and the dies in a constraint state inside a heat treatment furnace to develop the shape memory effect by aging, and then quench the alloys in a water basin [2]. To reduce the use of expensive die sets in the forming and the constraint aging process at elevated temperature, it might be worthwhile to try forming the shape memory alloys at room temperature in order to see their form accuracy and shape memory effect in cold state and after the subsequent heat treatment without additional dies. This study is thus aimed to investigate the feasibility of the above proposed processes: cold forming with only one die set and aging without any further die set.
机译：Ni-Ti形状记忆合金具有形状记忆效果和超弹性的多功能特性，这取决于与其与马氏体和奥氏体相之间的转化温度相关的应用温度[1]。为了表明它们的形状记忆效应，它们的马氏体相应在工作温度下。由于施加负载并且仍保持在载荷之后，即使在去除负载之后，也可以仅通过将超出合金的奥氏体转化点的温度升温来消失，这是一个明显的变形。将合金形成为形状的常规方法具有形状记忆效应是用热状态的一对模具形成合金，使合金和模具保持在热处理炉内的约束状态下，以开发形状记忆效应通过衰老，然后在水盆地中淬灭合金[2]。为了减少在升高的温度下在成型和约束老化过程中使用昂贵的模具，可以尝试在室温下形成形状记忆合金，以便在寒冷状态下看到它们的形式精度和形状记忆效果随后的热处理而没有额外的模具。因此，该研究旨在调查上述方法的可行性：冷成形只有一个模具和老化而没有任何进一步的模具。

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