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The Influence of Grain Size on the Mechanical Damping Behavior of Aluminum

Haneul Jang Kwangmin Choi Jaehyuck Shin Donghyun Bae Hyunjoo Choi
Archives of Metallurgy and Materials | 2019 | vol. 64 | No 2 | 475-479 | DOI: 10.24425/amm.2019.127562
Keywords Al Tensile properties Damping behavior grain size
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Abstract

An understanding of the fundamental correlation between grain size and material damping is crucial for the successful development of structural components offering high strength and good mechanical energy absorption. With this regard, we fabricated aluminum sheets with grain sizes ranging from tens of microns down to 60 nm and investigated their tensile properties and mechanical damping behavior. An obvious transition of the damping mechanism was observed at nanoscale grain sizes, and the underlying causes by grain boundaries were interpreted.

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Authors and Affiliations

Haneul Jang
Kwangmin Choi
Jaehyuck Shin
Donghyun Bae
Hyunjoo Choi

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

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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Authors and Affiliations

Yongwook Song
1
ORCID: ORCID
Daeyoung Kim
1
ORCID: ORCID
Seungjin Nam
1
ORCID: ORCID
Kee-Ahn Lee
2
ORCID: ORCID
Hyunjoo Choi
1
ORCID: ORCID
  1. Kookmin University, School of Materials Science and Engineering, Seoul, Republic of Korea
  2. Inha University, Department of Materials Science and Engineering, Incheon 22212, Republic of Korea

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