Effect of Interdendritic Precipitations on the Mechanical Properties of GBF or EMS Processed Al-Zn-Mg-Cu Alloys

Sangeun Park; Saif Haider Kayani; Hyungrae Kim; Im Doo Jung; N.S. Reddy; Kwangjun Euh; Jae Bok Seol; Jung Gi Kim; Hyokyung Sung

doi:10.3390/cryst11101162

Crystals (Sep 2021)

Effect of Interdendritic Precipitations on the Mechanical Properties of GBF or EMS Processed Al-Zn-Mg-Cu Alloys

Sangeun Park,
Saif Haider Kayani,
Hyungrae Kim,
Im Doo Jung,
N.S. Reddy,
Kwangjun Euh,
Jae Bok Seol,
Jung Gi Kim,
Hyokyung Sung

Affiliations

Sangeun Park: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
Saif Haider Kayani: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
Hyungrae Kim: Korea Aerospace Industries, Sacheon 52529, Korea
Im Doo Jung: Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
N.S. Reddy: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
Kwangjun Euh: Department of Aluminum, Korea Institute of Materials Science, Changwon 51508, Korea
Jae Bok Seol: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
Jung Gi Kim: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
Hyokyung Sung: Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju 52828, Korea

DOI: https://doi.org/10.3390/cryst11101162
Journal volume & issue: Vol. 11, no. 10
p. 1162

Abstract

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The effects of nanoprecipitations on the mechanical properties of Al-Zn-Mg-Cu alloys after GBF (gas bubbling filtration) and EMS (electromagnetic stirring) casting were investigated. Dendritic cell structures were formed after GBF processing, while globular dendritic structures were nucleated after EMS processing. Equiaxed cell sizes were smaller in the EMS-processed specimens compared to the GBF-processed specimens, confirmed by EBSD (electron backscatter diffraction) analysis. Nanoprecipitations of η′ phases inside of dendrites were observed by TEM (transmission electron microscope), and other Fe-bearing compounds were located in the dendritic boundaries. The yield strength of the T4 and T6 heat-treated specimens was close to 400 MPa and 500 MPa, respectively. Fractographic analysis was performed to investigate the effect of precipitations on tensile fracture.

Published in Crystals

ISSN: 2073-4352 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Crystallography
Website: http://www.mdpi.com/journal/crystals/

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