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Effect of Milling Time Parameter on the Microstructure and the Thermoelectric Properties of n-Type BI2TE2.7SE0.3 Alloys

P. Sharief B. Madavali J.M. Koo H.J. Kim S. Hong S.-J. Hong
Archives of Metallurgy and Materials | 2019 | vol. 64 | No 2 | 585-590 | DOI: 10.24425/amm.2019.127582
Keywords ball milling Milling time microstructure thermoelectric properties ZT
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Abstract

Nanostructured thermoelectric materials receiving great attention for its high thermoelectric performance. In this research, nanostructured n-type Bi2Te2.7Se0.3 alloys have prepared using high energy ball milling and followed by spark plasma sintering. Also, we have varied ball milling time to investigate milling time parameter on the thermoelectric properties of n-type Bi2Te2.7Se0.3 powder. The powders were discrete at 10 min milling and later particles tend to agglomerate at higher milling time due to cold welding. The bulk fracture surface display multi-scale grains where small grains intersperse in between large grains. The maximum Seebeck coefficient value was obtained at 20-min milling time due to their lower carrier density. The κ values were decreased with increasing milling time due to the decreasing trend observed in their κL values. The highest ZT of 0.7 at 350 K was observed for 30-min milling time which was ascribed to its lower thermal conductivity. The Vickers hardness values also greatly improved due to their fine microstructure.

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Authors and Affiliations

P. Sharief
B. Madavali
J.M. Koo
H.J. Kim
S. Hong
S.-J. Hong

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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