Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes
In this study, different volume fractions of silicon-carbide-reinforced AA2024 matrix composites were successfully fabricated using stir-casting (SC) and die-casting (DC) processes. The microstructural difference and physical properties of the composites during the manufacturing process were investi...
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2021-01-01
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author | Sangmin Shin Hyeonjae Park Byeongjin Park Sang-Bok Lee Sang-Kwan Lee Yangdo Kim Seungchan Cho Ilguk Jo |
author_facet | Sangmin Shin Hyeonjae Park Byeongjin Park Sang-Bok Lee Sang-Kwan Lee Yangdo Kim Seungchan Cho Ilguk Jo |
author_sort | Sangmin Shin |
collection | DOAJ |
description | In this study, different volume fractions of silicon-carbide-reinforced AA2024 matrix composites were successfully fabricated using stir-casting (SC) and die-casting (DC) processes. The microstructural difference and physical properties of the composites during the manufacturing process were investigated in detail. The microstructural analysis found that the composite produced by the SC process had some reinforcement clusters and pores; however, defects and clusters significantly decreased after the DC process. In particular, the degree of reinforcement dispersion was quantitatively analyzed and compared before and after the DC process using the dispersion-analysis method. As a result of quantitative evaluation, the degree of dispersion was improved 2.5, 4.6, and 4.0 times with 3 vol.%, 6 vol.%, and 9 vol.% SiC-reinforced composite after the DC process, respectively. The electron backscatter diffraction (EBSD) analysis showed that the grain size of the 9 vol.% SiC-reinforced DC composite (17.67 μm) was 75% smaller than that of the SC composite (68.06 μm). The average tensile strength and hardness of the 9 vol.% SiC-reinforced DC composite were 2 times higher than those of the AA2024 matrix. The superior mechanical properties of the DC-processed composite can be attributed to the increase in dispersivity of the SiC particles and to decreases in defects and grain size during the DC process. |
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spelling | doaj.art-edc9e50e08cd4981af1190537e2de14f2023-12-03T14:09:58ZengMDPI AGApplied Sciences2076-34172021-01-0111395210.3390/app11030952Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting ProcessesSangmin Shin0Hyeonjae Park1Byeongjin Park2Sang-Bok Lee3Sang-Kwan Lee4Yangdo Kim5Seungchan Cho6Ilguk Jo7Department of Functional Composites, Korea Institute of Materials Science (KIMS), Changwon 51508, KoreaDepartment of Functional Composites, Korea Institute of Materials Science (KIMS), Changwon 51508, KoreaDepartment of Functional Composites, Korea Institute of Materials Science (KIMS), Changwon 51508, KoreaDepartment of Functional Composites, Korea Institute of Materials Science (KIMS), Changwon 51508, KoreaDepartment of Functional Composites, Korea Institute of Materials Science (KIMS), Changwon 51508, KoreaSchool of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaDepartment of Functional Composites, Korea Institute of Materials Science (KIMS), Changwon 51508, KoreaDepartment of Advanced Materials Engineering, Dong-Eui University, Busan 47340, KoreaIn this study, different volume fractions of silicon-carbide-reinforced AA2024 matrix composites were successfully fabricated using stir-casting (SC) and die-casting (DC) processes. The microstructural difference and physical properties of the composites during the manufacturing process were investigated in detail. The microstructural analysis found that the composite produced by the SC process had some reinforcement clusters and pores; however, defects and clusters significantly decreased after the DC process. In particular, the degree of reinforcement dispersion was quantitatively analyzed and compared before and after the DC process using the dispersion-analysis method. As a result of quantitative evaluation, the degree of dispersion was improved 2.5, 4.6, and 4.0 times with 3 vol.%, 6 vol.%, and 9 vol.% SiC-reinforced composite after the DC process, respectively. The electron backscatter diffraction (EBSD) analysis showed that the grain size of the 9 vol.% SiC-reinforced DC composite (17.67 μm) was 75% smaller than that of the SC composite (68.06 μm). The average tensile strength and hardness of the 9 vol.% SiC-reinforced DC composite were 2 times higher than those of the AA2024 matrix. The superior mechanical properties of the DC-processed composite can be attributed to the increase in dispersivity of the SiC particles and to decreases in defects and grain size during the DC process.https://www.mdpi.com/2076-3417/11/3/952Al matrix composites (AMCs)stir-casting (SC)die-casting (DC)dispersion mechanismmechanical properties |
spellingShingle | Sangmin Shin Hyeonjae Park Byeongjin Park Sang-Bok Lee Sang-Kwan Lee Yangdo Kim Seungchan Cho Ilguk Jo Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes Applied Sciences Al matrix composites (AMCs) stir-casting (SC) die-casting (DC) dispersion mechanism mechanical properties |
title | Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes |
title_full | Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes |
title_fullStr | Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes |
title_full_unstemmed | Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes |
title_short | Dispersion Mechanism and Mechanical Properties of SiC Reinforcement in Aluminum Matrix Composite through Stir- and Die-Casting Processes |
title_sort | dispersion mechanism and mechanical properties of sic reinforcement in aluminum matrix composite through stir and die casting processes |
topic | Al matrix composites (AMCs) stir-casting (SC) die-casting (DC) dispersion mechanism mechanical properties |
url | https://www.mdpi.com/2076-3417/11/3/952 |
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