Open AccessStudy on the continuous phase evolution and physical properties of gas-atomized high-entropy alloy powders
Author(s) -
J. K. Liang,
Kuei-Chung Cheng,
Shih-Hsun Chen,
Jinghan Chen,
Shane Stadler,
Chia-Lin Li,
ChunHway Hsueh
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab5ee2
Subject(s) - materials science , annealing (glass) , alloy , hardening (computing) , metallurgy , precipitation hardening , composite material , thermodynamics , physics , layer (electronics)
In this study, AlCoCrFeNi high entropy alloy (HEA) powders were fabricated by gas atomization process, and the effects of annealing heat treatment on phase evolution and mechanical properties were investigated. The as-atomized powders have pure BCC phase with a spherical shape and equal composition distribution, and then the FCC and sigma phase sequentially generated after annealing. The mechanical property such as hardness was evidently enhanced, which was caused by precipitation hardening effect. After the raw powders were annealed at 600 °C, the FCC (Al–Ni) phase began to precipitate, the its phase intensity raised with the annealing temperature. Then, the sigma phase (Fe–Cr) formed as the annealing temperature reached 800 °C. Both mechanical properties and lattice constant were influenced by heating effect. According to the results, the lattice became loose with the increasing temperature. In summary, the mechanical properties and phase constitutions of gas-atomized AlCoCrFeNi HEA powders can be adjusted via annealing process, resulting in precipitation hardening effect.