Large elastocaloric effect driven by stress-induced two-step structural transformation in a directionally solidified Ni55Mn18Ga27 alloy
Large elastocaloric effect driven by stress-induced two-step structural transformation in a directionally solidified Ni55Mn18Ga27 alloy
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定向凝固 Ni55Mn18Ga27 合金中应力诱导的两步结构转变驱动的大弹热效应
DOI：
10.1016/j.scriptamat.2019.01.014
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发表时间：
2019
影响因子：
6
通讯作者：
Liang Zuo
中科院分区：
文献类型：
--
作者：
Dong Li;Zongbin Li;Jiajing Yang;Zhenzhuang Li;Bo Yang;Haile Yan;Dunhui Wang;Long Hou;Xi Li;Yudong Zhang;Claude Esling;Xiang Zhao;Liang Zuo
在Ni-Mn-Ga合金中经常观察到由温度变化或外应力引起的一级马氏体间相变。在这里，利用马氏体间相变来加强弹性热效应。通过应力诱导的两步结构转变，即，马氏体相变和中间马氏体相变，在定向凝固Ni 55 Mn 18 Ga 27多晶合金中获得了高达−10.7 K的巨大绝热温度变化<001>，代表了迄今为止Ni-Mn-Ga合金中的最高值。结果表明，织构化和马氏体间相变是改善NiMn基多晶合金弹热性能的有效途径。
The first-order inter-martensitic transformation induced by temperature change or external stress is frequently observed in Ni-Mn-Ga alloys. Here, the inter-martensitic transformation is exploited to strengthen the elastocaloric effect. Through the stress-induced two-step structural transformation,i.e., martensitic and inter-martensitic transformation, giant adiabatic temperature change up to −10.7 K is obtained in a directionally solidified Ni55Mn18Ga27polycrystalline alloy with <001>Apreferred orientation, representing the highest value so far in Ni-Mn-Ga alloys. It is demonstrated that microstructure texturing together with introduction of inter-martensitic transformation could be an effective route to improve the elastocaloric properties in polycrystalline NiMn-based alloys.