Phase-transformation fronts evolution for stress- and strain-controlled tension tests in TiNi shape memory alloy
Phase-transformation fronts evolution for stress- and strain-controlled tension tests in TiNi shape memory alloy
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DOI：
10.1007/s11340-006-8351-y
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发表时间：
2006-08-01
影响因子：
2.4
通讯作者：
Tobushi, H.
中科院分区：
文献类型：
--
作者：
Pieczyska, E. A.;Gadaj, S. P.;Tobushi, H.
研究了TiNi形状记忆合金在应力-应变控制拉伸条件下相变前沿的形核与发展。一个热视觉相机被施加到注册的样品发出的红外辐射的分布，并找到它的温度变化。在加载过程中，窄带相当高的温度对应于马氏体相，从试样的中心部分开始，并朝着试样夹具发展，在这两种方法下，注册。在卸载过程中，合金的温度分布也出现了不均匀的倾斜带，并伴随着温度的降低发生了逆相变。在应力和应变控制试验下，分析了不同应变率下马氏体相变和逆相变的热机械方面。
Nucleation and development of phase transformation fronts in TiNi shape memory alloy subjected to the stress- and strain-controlled tension tests were investigated. A thermovision camera was applied to register the distribution of infrared radiation emitted by the specimen and to find its temperature variations. During the loading, narrow bands of considerably higher temperature corresponding to the martensitic phase, starting from the central part of the specimen and developing towards the specimen grips, under both approaches, were registered. The inclined bands of heterogeneous temperature distribution were observed also during the unloading process of the SMA, while the reverse transformation accompanied by temperature decrease took place. Thermomechanical aspects of martensitic and reverse transformations for various strain rates were analyzed under both stress- and strain-controlled tests.