Open AccessВлияние водорода на флуктуационное охрупчивание алюминия
Author(s) -
Д.А. Индейцев,
Е.В. Осипова
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.17.48221.17896
Subject(s) - hydrogen embrittlement , hydrogen , embrittlement , aluminium , materials science , vacancy defect , ab initio , hydrogen atom , activation energy , kinetic energy , atomic physics , crystallography , metallurgy , chemistry , physics , alkyl , organic chemistry , quantum mechanics
The main processes occurring during vacancy generation in aluminum in the presence of hydrogen are described on the base of ab initio methods using the meta-functional SCAN. It was shown that hydrogen reduces the vacancy generation energy from 2.8 eV to 0.8 eV. In this case, eight hydrogen atoms located in the tetrahedral voids of the lattice around one aluminum atom make it much easier for it to move to the interstitial site. In accordance with the kinetic concept of embrittlement the dependence of the activation energy of hydrogen embrittlement of aluminum is calculated on the concentration of hydrogen and temperature. It is shown that hydrogen reduces the time of aluminum embrittlement only if its concentration in aluminum is more than critical one (~3⋅〖10〗^(-4) at T=293 K).