Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (7): 1175-1183.DOI: 10.1007/s40195-021-01360-9

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First-Principles Investigation on Phase Stability, Elastic and Magnetic Properties of Boron Doping in Ni-Mn-Ti Alloy

Chenchen Xiong1,2, Jing Bai1,2,4(), Yansong Li1,2, Jianglong Gu3(), Xinzeng Liang1, Ziqi Guan1, Yudong Zhang5, Claude Esling5, Xiang Zhao1, Liang Zuo1   

  1. 1Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang, 110819, China
    2School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China
    3State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China
    4Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Qinhuangdao, 066004, China
    5Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux, UMR 7239, LEM3, CNRS, University of Lorraine, 57045, Metz, France
  • Received:2021-08-08 Revised:2021-09-07 Accepted:2021-09-23 Online:2022-07-10 Published:2021-12-03
  • Contact: Jing Bai,Jianglong Gu
  • About author:Jianglong Gu, gujianglong@ysu.edu.cn
    Jing Bai, baijing@neuq.edu.cn;

Abstract:

The all-d-metal Ni-Mn-Ti Heusler alloy has giant elastocaloric effect and excellent mechanical properties, which is different from the conventional Ni-Mn-based Heusler alloys. In this work, the preferred site occupation, phase stability, martensitic transformation, magnetic properties, and electronic structure of the B-doped Ni2Mn1.5Ti0.5 alloys are systematically investigated by the first-principles calculations. The results show that B atoms preferentially occupy the octahedral interstitial. The doped B atoms tend to exist in the (Ni2Mn1.5Ti0.5)1-xBx (x = 0.03, 0.06, 0.09) alloy in the form of aggregation distribution, and the martensitic transformation temperature decreases with the increase in the B content. For octahedral interstitial doping, the toughness and plasticity of the (Ni2Mn1.5Ti0.5)1-xBx alloys decrease, but the strength and rigidity are greatly enhanced. This is because a small part of the d-d hybridization in ternary Ni-Mn-Ti alloy is replaced by the p-d hybridization in Ni-Mn-Ti-B alloy.

Key words: Ni-Mn-Ti, First-principles calculations, Phase stability, Elastic properties, Magnetic properties