Elucidating the Effects of the Composition on Hydrogen Sorption in TiVZrNbHf-Based High-Entropy Alloys.

ABSTRACT: A number of high-entropy alloys (HEAs) in the TiVZrNbHf system have been synthesized by arc melting and systematically evaluated for their hydrogen sorption characteristics. A total of 21 alloys with varying elemental compositions were investigated, and 17 of them form body-centered-cubic (bcc) solid solutions in the as-cast state. A total of 15 alloys form either face-centered-cubic (fcc) or body-centered-tetragonal (bct) hydrides after exposure to gaseous hydrogen with hydrogen per metal ratios (H/M) as high as 2.0. Linear trends are observed between the volumetric expansion per metal atom [(V/Z)_fcc/bct - (V/Z)_bcc/hcp]/(V/Z)_bcc/hcp with the valence electron concentration and average Pauling electronegativity (χ

SUBMITTER: Ek G 

PROVIDER: S-EPMC7871323 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature