A multielement alloying strategy to improve elastocaloric and mechanical properties in Ni–Mn-based alloys via copper and boron

• DOI: 10.1016/j.scriptamat.2020.04.001
• Publication Date: 2020-05-13T13:35:01Z
• Authors: Xiao-Ming Huang; Ying Zhao; Hai-Le Yan; Nan Jia; Shuai Tang; Jing Bai; Bo Yang; Zongbin Li; Yudong Zhang; Claude Esling; Xiang Zhao; Liang Zuo
• Keywords: [SPI]Engineering Sciences [physics]; 0205 materials engineering; [SPI] Engineering Sciences [physics]; Magnetic shape memory alloys; Martensitic transformation; Doping; 02 engineering and technology; Ni-Mn-In; Elastocaloric

Abstract Ni–Mn-based shape memory alloy is a promising candidate as the solid-state elastocaloric refrigerant in the micro- or nano-refrigeration fields owing to the required small driving force. In this letter, we report a multielement alloying strategy, i.e., the co-substitution of non-magnetic element and boron for Mn, to improve the elastocaloric refrigeration efficiency and mechanical properties simultaneously. Under Cu and B co-substitution, a large adiabatic temperature change of –12.8 K and a giant specific adiabatic temperature change of 41.0 K/GPa were obtained in the directionally solidified Ni50(Mn31.7Cu2.5B0.3)In15.5 alloy. The proposed alloying manner is also favorable to enhance fracture resistance and cyclability.