Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (4): 514-522.DOI: 10.1007/s40195-020-01113-0

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Prediction on Phase Stabilities of the Zr-H System from the First-Principles

Miao Chen1, Wu Qin2, Yixuan Hu2, Yiren Wang2, Yong Jiang2(), Xiaosong Zhou1, Shuming Peng1(), Yibei Fu1   

  1. 1Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, China
    2State Key Laboratory for Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha, 410083, China
  • Received:2020-04-12 Revised:2020-05-19 Accepted:2020-06-03 Online:2021-04-10 Published:2021-03-30
  • Contact: Yong Jiang,Shuming Peng
  • About author:Shuming Peng,pengshuming@caep.cn
    Yong Jiang,yjiang@csu.edu.cn;

Abstract:

Basic fundamentals governing the hydrogenation of Zr and its alloys have both theoretical and practical importance. In this work, first-principles calculations have been performed to evaluate the relative stabilities of various possible phases in ZrHx (x=1-2) under different temperatures and pressures. It was predicted that fct-γ and ε phases with various different H-atom configurations can be energetically favorable for ZrHx (x=1, 1.25 and 1.5), while ZrH1.75 and ZrH2 prefer fct-ε phase only. Fcc-δ phase is less favored in energy at any H concentrations, but can be mechanically stable in some cases. The thermodynamically stable and metastable phase stability diagrams were then constructed for a wide temperature and H concentration range, to predict the environment-dependent formation of ZrHx during hydrogenation.

Key words: Zr-H, Hydrogenation, Hydride, Phase stability, First-principles