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Tension/torsion tests of pseudoelastic, polycrystalline NiTi shape memory alloys under temperature control

机译：伪弹性，多晶NiTi形状记忆合金在温度控制下的拉伸/扭转试验

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摘要

In this contribution, different mechanical tests on hourglass-shaped tubular NiTi specimens are presented. The specimens consist of a Ni-rich (50.7 at.%) NiTi alloy exhibiting pseudoelastic behavior at room temperature. Considering two-dimensional tension/torsion experiments, the measurements of elongation and twist are crucial and there are no commercially available standard procedures. Therefore, a novel device to measure and control axial and torsional strains within a well-defined gage section of the specimen was developed. Additionally, the specimen temperature is controlled actively. This is important to interpret the mechanical behavior and to distinguish between material-related viscous effects and apparent strain signals related to temperature deviations. Two different procedures are used for cooling and heating. To achieve higher specimen temperatures the specimen is electrically energized. Cold nitrogen is used for cooling. The use of an active temperature control scheme allows to realize a very good temperature stability, which outperforms the traditional temperature control where a fluid which is kept at a constant temperature flows through the specimen chamber. Our new method of temperature control allows to level out sudden changes in the temperature field which are related to the generation/absorption of latent heat during forward and reverse martensitic transformations.
机译：在此贡献中，提出了对沙漏形管状NiTi试样的不同机械测试。样品由富镍（50.7 at。％）的镍钛合金组成，在室温下表现出拟弹性行为。考虑到二维拉伸/扭转实验，伸长率和扭曲的测量是至关重要的，并且没有可商购的标准程序。因此，开发了一种新颖的测量和控制标本的标距部分内的轴向和扭转应变的装置。此外，可以主动控制样品温度。这对于解释机械行为以及区分与材料有关的粘性效应和与温度偏差有关的表观应变信号非常重要。使用两种不同的程序进行冷却和加热。为了达到更高的样品温度，样品需要通电。冷氮气用于冷却。主动温度控制方案的使用允许实现非常好的温度稳定性，这优于传统的温度控制，在传统的温度控制中，保持恒定温度的流体流经样品室。我们的温度控制新方法可以消除温度场中的突然变化，这与马氏体正向和反向转变过程中潜热的产生/吸收有关。

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