We report the occurrence of stress-induced burst-type martensitic transformation in a 〈116〉 oriented CuAlMn single crystal. The burst-type transformation is observed in the reverse transformation of unloading from 250 K to 370 K in tension, showing strong coupling with plastic deformation in the temperature range between 310 K and 370 K. Such coupling greatly exacerbates the stress hysteresis and energy dissipation in association with the stress-induced transformation, resulting in a significant enhancement in the mechanical damping and degradation in the elastocaloric response. In particular, the merit index for damping exhibits a remarkably high value of 0.903 at 370 K, demonstrating the huge potential of coupled burst-type transformation and plastic deformation in manipulating damping properties. Moreover, it is evidenced that the microstructural evolution of burst-type transformation greatly deviates from that of the thermoelastic transformation.

中文翻译：

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爆发型马氏体相变对〈116〉取向 Cu70.5Al17.5Mn12 单晶超弹性和弹热性能的影响

我们报道了 <116> 取向的 CuAlMn 单晶中发生了应力诱发的爆裂型马氏体转变。在250 K至370 K拉伸卸载的逆向转变中观察到爆发型转变，在310 K至370 K温度范围内与塑性变形表现出强耦合。这种耦合极大地加剧了应力滞后和能量耗散。与应力引起的转变相关，导致机械阻尼的显着增强和弹热响应的退化。特别是，阻尼的品质指数在 370 K 时表现出非常高的值 0.903，这表明耦合突发型转变和塑性变形在操纵阻尼性能方面具有巨大的潜力。此外，有证据表明，爆发型转变的微观结构演化与热弹性转变的微观结构演化有很大不同。