Influence of Cr on microstructure and elastocaloric effect in Ni-Mn-In-Co-Cr polycrystalline alloys

被引：35
作者：
Shen, Ao [1 ,2 ]
Sun, Wen [1 ,2 ]
Zhao, Dewei [1 ,2 ,3 ]
Liu, Jian [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, CAS Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
[2] Chinese Acad Sci, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
[3] Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
来源：
PHYSICS LETTERS A | 2018年 / 382卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Microstructure; Martensitic transformation; Elastocaloric effect; Shape memory alloys; SHAPE-MEMORY ALLOYS; HYSTERESIS; SINGLE;
D O I：
10.1016/j.physleta.2018.06.022
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Ni-Mn-based metamagnetic shape memory alloys have been proposed as potential elastocaloric refrigerants. The intrinsic brittleness of the alloys has limited their cooling application. Introducing a soft second phase is an effective way to reduce the brittleness. From the viewpoint of application, the effect of second phase on elastocaloric effect should be illustrated. In this paper, we have investigated the microstructure, martensitic transformation and elastocaloric effect of Ni45Mn37-xIn13Co5Crx (x = 0, 1 and 2) polycrystalline alloys. Single-phase and precipitates-containing microstructures are obtained for the undoped and doped alloys, respectively. The precipitates in Cr-doped alloys enhances the fracture strength but significantly hinders the martensitic transformation. Balancing the fracture strength and martensitic transformation, the Ni45Mn36In13Co5Cr alloy with small amount of precipitates along grain boundaries exhibits large cooling effects of 4-6 K in the temperature range of 317-353 K. (C) 2018 Elsevier B.V. All rights reserved.
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页码：2876 / 2879
页数：4
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