We discuss the suitability of laser-based resonant ultrasound spectroscopy (RUS) for the characterization of soft shearing modes in single crystals of shape memory alloys that are close to the transition temperatures. We show, using a numerical simulation, that the RUS method enables the accurate determination of the $c^{\prime }$ shear elastic coefficient, even for very strong anisotropy, and without being sensitive to misorientations of the used single crystal. Subsequently, we apply the RUS method to single crystals of three typical examples of shape memory alloys (Cu-Al-Ni, Ni-Mn-Ga, and NiTi), and discuss the advantages of using the laser-based contactless RUS arrangement for temperature-resolved measurements of elastic constants.

中文翻译：

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马氏体转变附近形状记忆合金的剪切弹性系数的软化：基于激光的共振超声光谱研究

我们讨论了基于激光的共振超声光谱（RUS）表征形状记忆合金单晶中接近于转变温度的软剪切模式的适用性。我们显示，通过数值模拟，RUS方法可以准确确定$C^{\prime }$剪切弹性系数，即使对于非常强的各向异性，并且对所用单晶的取向错误也不敏感。随后，我们将RUS方法应用于形状记忆合金的三个典型示例（Cu-Al-Ni，Ni-Mn-Ga和NiTi）的单晶中，并讨论了使用基于激光的非接触式RUS布置在温度方面的优势解析的弹性常数测量。