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Effect of Milling Duration on Oxide-Formation Behavior of Oxide-Dispersion-Strengthened High-Entropy Alloys

Yongwook Song Daeyoung Kim Seungjin Nam Kee-Ahn Lee Hyunjoo Choi

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 735-740 | DOI: 10.24425/amm.2021.136371

Słowa kluczowe oxide dispersion strengthening (ODS) high entropy alloys severe plastic deformation in situ second phases milling time effects

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Abstrakt

Oxide-dispersion-strengthened high-entropy alloys were produced by hot-pressing a ball-milled mixture of Y2O3 and atomized CoCrFeMnNi powder. The effect of milling duration on grain size reduction, oxide formation behavior, and the resulting mechanical properties of the alloys was studied. Both the alloy powder size and Y2O3 particle size decreased with milling time. Moreover, the alloy powder experienced severe plastic deformation, dramatically generating crystalline defects. As a result, the grain size was reduced to ~16.746 nm and in-situ second phases (e.g., MnO2 and σ phase) were formed at the defects. This increased the hardness of the alloys up to a certain level, although excessive amounts of in-situ second phases had the reverse effect.

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Autorzy i Afiliacje

Yongwook Song

e-mail:

ORCID:

Daeyoung Kim

e-mail:

ORCID:

Seungjin Nam

e-mail:

ORCID:

Kee-Ahn Lee

e-mail:

ORCID:

Hyunjoo Choi

e-mail:

ORCID:

Kookmin University, School of Materials Science and Engineering, Seoul, Republic of Korea
Inha University, Department of Materials Science and Engineering, Incheon 22212, Republic of Korea