Enhanced elastocaloric effect and mechanical properties of Gd-doped Ni-Co-Mn-Ti-Gd metamagnetic shape memory alloys

被引:8
作者
Xu, Feng [1 ]
Zhu, Can [1 ]
Wang, Jian [1 ]
Luo, Feng [1 ]
Zhu, Xinqiang [1 ]
Xu, Jiahui [1 ]
Chen, Shuquan [1 ]
Wang, Jiafu [1 ]
Ma, Guoliang [2 ]
Chen, Fenghua [2 ]
Kuang, Yafei [2 ]
He, Jun [3 ]
Sun, Zhigang [1 ,2 ]
机构
[1] Wuhan Univ Technol, State Key Lab Adv Mat Composite Technol, Wuhan 430070, Peoples R China
[2] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China
[3] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
基金
中国国家自然科学基金;
关键词
Ni-Co-Mn-Ti alloy; All-d metal Heusler alloy; Elastocaloric effect; Solid-state refrigeration; MARTENSITIC-TRANSFORMATION; MICROSTRUCTURE; CYCLABILITY; STRAIN;
D O I
10.1016/j.jallcom.2023.170768
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Improving elastocaloric effect (eCE) and mechanical properties is the key to developing high-performance eCE cooling materials. In this paper, the metamagnetic shape memory alloys Ni35.5Co13.5Mn35Ti15-xGdx (x = 0-0.9) were successfully prepared by arc melting method, and the effects of Gd substitution for Ti on the martensitic transformation (MT) temperature, phase composition, microstructure, eCE and mechanical properties of the alloys were systematically investigated. With the introduction of Gd elements, the transformation temperature shifts to a low temperature, and the mechanical properties of the alloy are also enhanced. The fracture strength increased from 980 MPa (x = 0) to 1142 MPa (x = 0.9). At room temperature (RT), a large adiabatic temperature change of + 13.5 K/- 12.7 K is obtained after loading/unloading, and a constant temperature change of + 5.6 K/- 5.5 K is obtained without apparent degradation under the compressive stress of 400 MPa during 61 cycles for all-d metal Heusler Ni36.5Co13.5Mn35Ti14.9Gd0.1 alloy. The adiabatic temperature change of 13.5 K exceeds the elastocaloric temperature change of most NiMn-based alloys available at present, and the mechanical properties of Ni-Co-Mn-Ti-Gd alloy are at a high level among the NiMn-based alloys. The precipitation of the Gd-rich second phase along the grain boundaries is in-trinsically responsible for the improved mechanical properties.& COPY; 2023 Elsevier B.V. All rights reserved.
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页数:9
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