Scholarlink

Abstract <p>–—The work investigates the structure and substructural properties of the high-entropy alloy (HEA) AlCoNiTiNb saturated with hydrogen using X-ray diffraction analysis and positron annihilation spectroscopy (PAS). The study examines the changes in hydrogen-induced defects in HEAs during heating in vacuum and hydrogen environments, as well as the influence of temperature and hydrogen content on the formation of various imperfections. Based on a database of crystallographic standards created by the USPEX algorithm, it was established that the structural state is determined by stable phases (STRUC-1, STRUC-2, and STRUC-3). These structures correspond to cells with parameters close to simple cubic lattices. The study revealed correlations between positron annihilation parameters (S and W) and defect concentration as a function of temperature and hydrogen saturation. The expected proportion of hydride phases in the AlCoNiTiNb alloy was estimated to be within 5–10%, with maximum hydrogen accumulation occurring in the temperature range of 200–500°C. Despite the formation of hydride phases, the material demonstrates low cyclic stability, which limits its long-term application in hydrogen energy.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Substructural State of the High-Entropy Alloy AlCoNiTiNb under Hydrogen Saturation and Heating

  • 期刊论文

  • 发表日期：

    2025年12月8日

查看全文
  • R. S. Laptev,
  • Yu. A. Abzaev,
  • S. A. Guda,
  • A. A. Klopotov,
  • M. Koptsev,
  • A. V. Tereshchenko,
  • I. A. Ushakov,
  • M. Kruglyakov,
  • P. Homidzoda,
  • A. M. Lider

摘要

Abstract

–—The work investigates the structure and substructural properties of the high-entropy alloy (HEA) AlCoNiTiNb saturated with hydrogen using X-ray diffraction analysis and positron annihilation spectroscopy (PAS). The study examines the changes in hydrogen-induced defects in HEAs during heating in vacuum and hydrogen environments, as well as the influence of temperature and hydrogen content on the formation of various imperfections. Based on a database of crystallographic standards created by the USPEX algorithm, it was established that the structural state is determined by stable phases (STRUC-1, STRUC-2, and STRUC-3). These structures correspond to cells with parameters close to simple cubic lattices. The study revealed correlations between positron annihilation parameters (S and W) and defect concentration as a function of temperature and hydrogen saturation. The expected proportion of hydride phases in the AlCoNiTiNb alloy was estimated to be within 5–10%, with maximum hydrogen accumulation occurring in the temperature range of 200–500°C. Despite the formation of hydride phases, the material demonstrates low cyclic stability, which limits its long-term application in hydrogen energy.