Crystallography of stress-induced martensitic transformation and giant elastocaloric effect in a A textured Ni27Cu21Mn46Sn6 shape memory alloy
Crystallography of stress-induced martensitic transformation and giant elastocaloric effect in a A textured Ni27Cu21Mn46Sn6 shape memory alloy
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DOI：
10.1016/j.actamat.2023.119546
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发表时间：
2023-11
期刊：
影响因子：
9.4
通讯作者：
Jiajing Yang;Honglin Wang;Zongbin Li;Naifu Zou;Haile Yan;Bo Yang;Liang Zuo
中科院分区：
文献类型：
--
作者：
Jiajing Yang;Honglin Wang;Zongbin Li;Naifu Zou;Haile Yan;Bo Yang;Liang Zuo
形状记忆合金利用应力诱发马氏体相变产生的潜热来实现弹性热效应，适合于固态冷却技术作为传统蒸汽压缩制冷的替代方案。本文研究了定向凝固Ni_（27）Cu_（21）Mn_（46）Sn_（66）形状记忆合金应力诱发马氏体相变的晶体学和弹热效应<001>。通过离位电子背散射衍射（EBSD）测量，证实了在压缩载荷作用下由奥氏体向单一的6 M马氏体转变，两相之间遵循{1 0 1}A//{1 - 2 - 6} M和<1 0 - 1>A//<-6 - 6 1> M的特定转变取向关系。此外，由于在凝固过程中通过控制相变过程中的晶格体积变化和由温度梯度效应促进的显微组织织构化而定制的大相变熵变的协同效应，本发明的合金可以表现出非常显著的弹热效应，当释放460 MPa的中等压缩载荷时，具有高达-31.8 K的极高的绝热温度变化值。这一工作将有助于深入研究应力诱发马氏体相变晶体学，并为设计高性能弹热材料提供一些启示。
Shape memory alloys exploit the latent heat yielded by stress-induced martensitic transformation to achieve elastocaloric effect, being suited for solid-state cooling technology as an alternative to conventional vapor-compression refrigeration. In this work, the crystallography of stress-induced martensitic transformation and elastocaloric effect in a polycrystalline Ni27Cu21Mn46Sn6shape memory alloy with <001>Apreferential orientation produced by means of directional solidification were studied. By performingex-situelectron backscatter diffraction (EBSD) measurements, the transition from austenite to a single variant of 6 M martensite induced by compressive loading was evidenced, following a specific transformation orientation relationship of {1 0 1}A//{1 –2 –6}Mand <1 0 − 1>A//<–6 –6 1>Mbetween two phases. Moreover, owing to the synergistic effect of large transformation entropy change tailored through manipulating the lattice volume change across the phase transformation and microstructure texturing promoted by temperature gradient effect during solidification process, the present alloy can demonstrate very remarkable elastocaloric effect, with an extremely high value of adiabatic temperature variation up to –31.8 K upon releasing a moderate compressive loading of 460 MPa. This work is expected to give insight into stress-induced martensitic transformation crystallography and offer some inspirations for designing high-performance elastocaloric materials.