Elastocaloric cooling and heating using R-phase transformation in hot rolled Ni-Ti-Fe shape memory alloys with 2 and 4 at% Fe content
Elastocaloric cooling and heating using R-phase transformation in hot rolled Ni-Ti-Fe shape memory alloys with 2 and 4 at% Fe content
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DOI：
10.1016/j.jallcom.2018.11.406
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发表时间：
2019-04-05
影响因子：
6.2
通讯作者：
Kakeshita, Tomoyki
中科院分区：
文献类型：
--
作者：
Aaltio, Ilkka;Fukuda, Takashi;Kakeshita, Tomoyki
铁掺杂的Ni-Ti形状记忆合金具有R相变。应力诱导的R相变及其逆相变可用于产生基于弹性热加热和冷却的温度变化。本文采用三种不同的方法研究了热轧Ni-48 Ti 50 Fe 2和Ni-46 Ti 50 Fe 4合金的弹热性能：1）量热法和比热测量; 2）机械应力-应变行为和基于麦克斯韦关系的计算;我们比较了与不同方法相关的结果，并提出了这些合金中与弹热效应相关的基本性质。我们表明，由于能量耗散的R-相变的温度变化是轻微的相比，弹性发热的温度变化。由R-B2相变潜热预测的最大绝热温度变化对于Ni 48 Ti 50 Fe 2合金为12.4K，对于Ni 46 Ti 50 Fe 4合金为8.7K。我们还报告了一个增加的趋势，峰值温度的弹性热效应时，所施加的应力增加。(C)2018爱思唯尔B. V.保留所有权利。
Iron-doped Ni-Ti shape memory alloys are known for their R-phase transformation. The stress-induced R-phase transformation and its reverse transformation can be utilized to create a temperature change based on elastocaloric heating and cooling. We studied the elastocaloric properties of hot rolled Ni-48 Ti50Fe2 and Ni46Ti50Fe4 alloys with three different approaches: 1) the calorimetry and specific heat measurements, 2) mechanical stress-strain behaviour and Maxwell relation based calculations and 3) direct measurement of adiabatic temperature change by stress application and removal. We compared the results related to different approaches and present the essential properties related to elastocaloric effect in these alloys. We show that the temperature change due to energy dissipation of the R-phase transformation is minor in comparison with the elastocaloric temperature change. The maximum adiabatic temperature change expected from the latent heat of R-B2 transformation is 12.4 K for the Ni48Ti50Fe2 alloy and 8.7 K for the Ni46Ti50Fe4 alloy. We also report an increasing tendency of the peak temperature for the elastocaloric effect when the applied stress increases. (C) 2018 Elsevier B.V. All rights reserved.