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Abstract

This study suggests a new way to modify the size and morphology of Al-Fe phases in modified AA 7075 by using an Fe-Mn solid solution powder as the precursor. When Fe and Mn are added in the form of a solid solution, the diffusion of Fe and Mn toward the Al is delayed, thus altering the chemical composition and morphology of the precipitates. The fine, spherical precipitates are found to provide a good balance between strength and ductility compared to the case where Fe and Mn are separately added.
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Bibliography

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Authors and Affiliations

Min Sang Kim
1 2
ORCID: ORCID
Dae Young Kim
3
ORCID: ORCID
Young Do Kim
1
ORCID: ORCID
Hyun Joo Choi
3
ORCID: ORCID
Se Hoon Kim
2
ORCID: ORCID

  1. Hanyang University, Department of Materials Science & Engineering, Seoul, Republic of Korea
  2. Metallic Material R&D Center, Korea Automotive Technology Institute, Cheonan-si, Republic of Korea
  3. Kookmin University, School of Materials Science and Engineering, Seoul, Republic of Korea
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Abstract

The aluminum composite with dispersed high entropy alloy were developed by stir casting involving the powder-in-tube method. First, Al0.5CoCrCuFeNi high entropy alloy (HEA) powder was made by mechanical alloying, and the powder was extruded in a tube-type aluminum container to form HEA precursor. The extruded HEA precursor was then dispersed in the aluminum matrix via stir casting. As a result, Fe-Cr-Ni based high-entropy phases was uniformly formed in the aluminum matrix, revealing ~158, 166, 235% enhancement of tensile strength by incorporating 1, 3, and 5 wt% HEA particles, respectively.
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Authors and Affiliations

Min Sang Kim
1 2
ORCID: ORCID
Han Sol Son
3
ORCID: ORCID
Gyeong Seok Joo
2
ORCID: ORCID
Young Do Kim
1
ORCID: ORCID
Hyun Joo Choi
3
ORCID: ORCID
Se Hoon Kim
2
ORCID: ORCID

  1. Hanyang University, Department of Materials Science & Engineering, Seoul, Republic of Korea
  2. Korea Automotive Technology Institute, Metallic Material R&D Center, Cheonan-si, Republic of Korea
  3. Kookmin University, School of Materials Science and Engineering, Seoul, Republic of Korea
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Abstract

Directed energy deposition (DED) is an additive manufacturing process wherein an energy source is focused on a substrate on which a feedstock material is simultaneously delivered, thereby forming a small melt pool. Melting, solidification, and subsequent cooling occur at high rates with considerable thermal gradients compared with traditional metallurgical processes. Hence, it is important to examine the effects of cooling rates on the microstructures and properties of the additive manufactured materials. In this study, after performing DED with various energy densities, we investigated the changes in the microstructures and Vickers hardness of cast Al-33 wt.% Cu alloy, which is widely used to estimate the cooling rate during processing by measuring the lamellar spacing of the microstructure after solidification. The effects of the energy density on the cooling rate and resultant mechanical properties are discussed, which suggests a simple way to estimate the cooling rate indirectly. This study corresponds to the basic stage of the current study, and will continue to apply DED in the future.
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Authors and Affiliations

Yeon-Joo Lee
1 2
ORCID: ORCID
Do-Hun Kwon
1
ORCID: ORCID
Eun-Ji Cha
1
ORCID: ORCID
Yong-Wook Song
2
ORCID: ORCID
Hyun-Joo Choi
2
ORCID: ORCID
Hwi-Jun Kim
1
ORCID: ORCID

  1. Korea Institute of Industrial Technology, Research Institute of Advanced Manufacturing & Materials Technology, 156, Gaetbeol-ro, Yeonsu-gu, Incheon, Republic of Korea 21999
  2. Kookmin University Dept. of Advanced Materials Engineering, Seoul, KS013, Republic of Korea

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