Elastocaloric Effect Associated with Different Types of Martensitic Transformations: Typical First-Order and Weak First-Order Ones
Elastocaloric Effect Associated with Different Types of Martensitic Transformations: Typical First-Order and Weak First-Order Ones
复制标题
与不同类型的马氏体转变相关的弹热效应：典型的一阶和弱一阶
DOI：
10.1002/pssb.201700246
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发表时间：
2017
影响因子：
1.6
通讯作者：
Kakeshita T.
中科院分区：
文献类型：
--
作者：
Xiao F.;Fukuda T.;Jin X.;Liu J.;Kakeshita T.
< jats: sec>< jats: label/>< jats: p>表现< jats: sub>< jats: sub>< jats: sub>< jats: sub>出典型的一级马氏体相变（MT）和Fe-31.2 Pd（at.%）的Ni 50 Fe 19 Ga 27 Co 4合金的弹性热效应合金表现出弱的一阶MT分别使用其单晶进行了比较。在Ni 50 Fe 19 Ga 27 Co 4合金中，弹热效应的温度依赖性出现了一个平坦区域< jats: sub>< jats: sub>< jats: sub>< jats: sub>，而Fe-31.2 Pd合金中没有这个区域。Ni < jats: sub>50 Fe < jats: sub>19 Ga < jats: sub>27 Co < jats: sub>4合金的弹热效应主要来源于应力诱导MT释放的潜热，而Fe-31.2 Pd合金的弹热效应主要来源于母相和马氏体相弹性变形引起的熵变。虽然两种合金在Ms时[001]方向上的杨氏模量< jats: italic>< jats: sub>几乎相同（< jats: italic>E = 2GPa），但其斜率d < jats: italic>E/dT< jats: italic>在两种合金之间有很大差异。< jats: sup>Ni < jats: sub>50 Fe < jats: sub>19 Ga < jats: sub>27 Co < jats: sub>4合金的K − 1约为0.003 GPa，< jats: sup>Fe-31.2 Pd合金的K − 1约为0.2 GPa。
< jats: sec>< jats: label/>< jats: p> Elastocaloric effects of a Ni< jats: sub> 50 Fe< jats: sub> 19 Ga< jats: sub> 27 Co< jats: sub> 4 alloy exhibiting a typical first‐order martensitic transformation (MT) and an Fe‐31.2 Pd (at.%) alloy exhibiting a weak first‐order MT, respectively, have been compared using their single crystals. A flat region appears in the temperature dependence of elastocaloric effect in the Ni< jats: sub> 50 Fe< jats: sub> 19 Ga< jats: sub> 27 Co< jats: sub> 4 alloy, while such region is missing in the Fe‐31.2 Pd alloy. The elastocaloric effect of the Ni< jats: sub> 50 Fe< jats: sub> 19 Ga< jats: sub> 27 Co< jats: sub> 4 alloy originates essentially from the latent heat released by the stress‐induced MT, while that in the Fe‐31.2 Pd alloy originates essentially from the entropy change caused by elastic deformation of the parent and martensite phases. Although the Young's modulus in the [001] direction at< jats: italic> M< jats: sub> s is nearly the same for the two alloys (< jats: italic> E∼ 2 GPa), its slope d< jats: italic> E/ d< jats: italic> T is largely different between the two alloys. It is approximately 0.003 GPa K< jats: sup>− 1 for the Ni< jats: sub> 50 Fe< jats: sub> 19 Ga< jats: sub> 27 Co< jats: sub> 4 alloy and 0.2 GPa K< jats: sup>− 1 for Fe‐31.2 Pd alloy.