Large elastocaloric effect in a polycrystalline Ni 45.7Co4.2Mn37.3Sb12.8 alloy with low transformation strain
Large elastocaloric effect in a polycrystalline Ni 45.7Co4.2Mn37.3Sb12.8 alloy with low transformation strain
复制标题
低转变应变多晶 Ni45.7Co4.2Mn37.3Sb12.8 合金中的大弹热效应
DOI：
10.1016/j.scriptamat.2018.12.019
复制
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：
Zhenzhuang Li;Zongbin Li;Jiajing Yang;Dong Li;Bo Yang;Haile Yan;Zhihua Nie;Long Hou;Xi Li;Yudong Zhang;Claude Esling;Xiang Zhao;Liang Zuo
Ni-Co-Mn-Sb 合金可以表现出大的弹热效应，其特征为应力引起的熵变 ΔSσ。然而，多晶合金固有的大脆性使得难以直接测量应力引起的温度变化ΔTad。在这里，我们展示了具有增强机械性能的定向凝固 Ni45.7Co4.2Mn37.3Sb12.8 合金的巨大弹热效应。通过压应力诱导马氏体相变实现了高达 9.4K 的大 ΔTadup，相变应变仅为 1.5%。此外，集成高达25.4Jkg−1K−1的大ΔSσ和46K的宽工作温度窗口，在250MPa的压应力下实现了930Jkg−1的巨大制冷量RCσ。
Ni-Co-Mn-Sb alloys can exhibit large elastocaloric effect characterized as stress-induced entropy change ΔSσ. However, the intrinsic large brittleness of polycrystalline alloys makes it difficult to directly measure the stress-induced temperature change ΔTad. Here, we demonstrate large elastocaloric effect in a directionally solidified Ni45.7Co4.2Mn37.3Sb12.8alloy with enhanced mechanical properties. Large ΔTadup to 9.4 K was realized through compressive stress-induced martensitic transformation with a low transformation strain of 1.5%. Moreover, with integrating large ΔSσup to 25.4 Jkg−1K−1and wide working temperature window of 46 K, a giant refrigeration capacityRCσof 930 Jkg−1was achieved under the compressive stress of 250 MPa.