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在方向固化 (Ni₅₀Mn₃₁Ti₁₉) 合金中,巨大的弹性热量效应和改善的周期稳定性₉₉B₁

Honglin Wang¹, Yueping Wang¹, Guoyao Zhang¹

¹Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.

Materials (Basel, Switzerland)

|October 16, 2024

概括

这项研究提出了一种新的合金形状记忆合金,表现出巨大的弹性热效应. 这种材料显示了固态冷却的显著温度变化和出色的循环稳定性.

科学领域:

材料科学材料科学材料科学
热力学是一种热力学.
固态物理固态物理

背景情况:

固态弹性热冷却需要具有较大的弹性热效应和高周期稳定性的先进材料.
超弹性形状记忆合金是这项技术的有希望的候选者.

研究的目的:

为增强弹性热冷却开发和描述一个有纹理的多晶 (Ni50Mn31Ti19) 99B1合金.
研究定向固化和合金对合金弹性热性质和循环性能的影响.

主要方法:

使用方向凝固来创建一个有纹理的多晶体结构.
通过评估在283K至373K的温度范围内的压力压力下的亚亚巴特温度变化 (那么下述) 来测量弹性热量效应.
循环稳定性在12000个循环中进行了评估,以确定衰减行为.

主要成果:

获得了巨大的弹性热量效应,在测试温度范围内,附带热量温度变化超过15K.
在从412 MPa在303 K下载时观察到的最大 ΔT 值为-27.2 K.
合金表现出了显著的周期性稳定性,在12000多个周期中保持了≥8.5K的ΔT,并且最小的衰减 (7.5×10−5K/周期).

结论:

开发的A纹理多晶 (Ni50Mn31Ti19) 99B1合金表现出优越的弹性热量特性和循环稳定性.
微结构纹理和通过合金引入二次阶段是提高性能的关键因素.
这种合金代表了固态弹性热热冷却技术的重大进步.

关键词:

在Ni-Mn-Ti合金中.循环稳定性的周期性稳定性具有弹性气温效应的弹性气温效应压力诱导的马氏体变化.

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