Effect of Semi-Solid Processing on the Microstructure and Mechanical Properties of Aluminum Alloy Chips with Eutectic Mg2Si Intermetallics
This study reports the microstructural changes and mechanical properties of high-strength aluminum alloy chips prepared in the semi-solid state at different temperatures, pressures, and holding times. In semi-solid processes, these processing parameters must be optimized because they affect the micr...
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| Veröffentlicht in: | Metals (Basel ) 2021-09, Vol.11 (9), p.1414 |
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| creator | Son, Yong Guk Jung, Sung Soo Park, Yong Ho Lee, Young Cheol |
| description | This study reports the microstructural changes and mechanical properties of high-strength aluminum alloy chips prepared in the semi-solid state at different temperatures, pressures, and holding times. In semi-solid processes, these processing parameters must be optimized because they affect the microstructure and mechanical properties of the chips. In microstructural analysis, these parameters clearly influenced the spheroidization of the aluminum matrix. The aluminum matrix was uniformly spheroidized after semi-solid processing, and the densities of the final samples increased with the holding time. After 30 min holding time at a given temperature, the density approached the theoretical density, but the compressive strength of the samples seriously deteriorated. Meanwhile, fracture surface investigation revealed a deformed Mg2Si phase, which is formed through a eutectic reaction. The strength of this phase significantly decreased after increasing the holding time of the semi-solid processing from 10 to 30 min. Therefore, deformation of the Mg2Si phase caused by diffusion of aluminum into this phase can be a key factor for the decrease in the mechanical properties of samples fabricated with 30 min holding time. |
| doi_str_mv | 10.3390/met11091414 |
| format | Article |
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In semi-solid processes, these processing parameters must be optimized because they affect the microstructure and mechanical properties of the chips. In microstructural analysis, these parameters clearly influenced the spheroidization of the aluminum matrix. The aluminum matrix was uniformly spheroidized after semi-solid processing, and the densities of the final samples increased with the holding time. After 30 min holding time at a given temperature, the density approached the theoretical density, but the compressive strength of the samples seriously deteriorated. Meanwhile, fracture surface investigation revealed a deformed Mg2Si phase, which is formed through a eutectic reaction. The strength of this phase significantly decreased after increasing the holding time of the semi-solid processing from 10 to 30 min. Therefore, deformation of the Mg2Si phase caused by diffusion of aluminum into this phase can be a key factor for the decrease in the mechanical properties of samples fabricated with 30 min holding time.</description><identifier>ISSN: 2075-4701</identifier><identifier>EISSN: 2075-4701</identifier><identifier>DOI: 10.3390/met11091414</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Alloys ; Aluminum alloys ; Aluminum base alloys ; Compressive strength ; Density ; Eutectic alloys ; Eutectic reactions ; fracture surface ; Fracture surfaces ; High strength alloys ; high-strength aluminum alloy ; Intermetallic compounds ; Magnesium compounds ; Mechanical properties ; Metal silicides ; Microscopy ; Microstructural analysis ; Microstructure ; Process parameters ; semi-solid ; Semi-solid processing ; Solidification ; Solids ; Spheroidizing ; Spray forming ; Theoretical density</subject><ispartof>Metals (Basel ), 2021-09, Vol.11 (9), p.1414</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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In semi-solid processes, these processing parameters must be optimized because they affect the microstructure and mechanical properties of the chips. In microstructural analysis, these parameters clearly influenced the spheroidization of the aluminum matrix. The aluminum matrix was uniformly spheroidized after semi-solid processing, and the densities of the final samples increased with the holding time. After 30 min holding time at a given temperature, the density approached the theoretical density, but the compressive strength of the samples seriously deteriorated. Meanwhile, fracture surface investigation revealed a deformed Mg2Si phase, which is formed through a eutectic reaction. The strength of this phase significantly decreased after increasing the holding time of the semi-solid processing from 10 to 30 min. Therefore, deformation of the Mg2Si phase caused by diffusion of aluminum into this phase can be a key factor for the decrease in the mechanical properties of samples fabricated with 30 min holding time.</description><subject>Alloys</subject><subject>Aluminum alloys</subject><subject>Aluminum base alloys</subject><subject>Compressive strength</subject><subject>Density</subject><subject>Eutectic alloys</subject><subject>Eutectic reactions</subject><subject>fracture surface</subject><subject>Fracture surfaces</subject><subject>High strength alloys</subject><subject>high-strength aluminum alloy</subject><subject>Intermetallic compounds</subject><subject>Magnesium compounds</subject><subject>Mechanical properties</subject><subject>Metal silicides</subject><subject>Microscopy</subject><subject>Microstructural analysis</subject><subject>Microstructure</subject><subject>Process parameters</subject><subject>semi-solid</subject><subject>Semi-solid processing</subject><subject>Solidification</subject><subject>Solids</subject><subject>Spheroidizing</subject><subject>Spray forming</subject><subject>Theoretical density</subject><issn>2075-4701</issn><issn>2075-4701</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>DOA</sourceid><recordid>eNpNUdtq20AQFSWFhiRP_YGFPhale5f2MRi3NcSk4PZZrEaz9hpJ6-6uKPmFfHXXdQmZl7lwODNnTlV9ZPReCEO_TJgZo4ZJJt9V15w2qpYNZVdv6g_VXUpHWqLlmhpzXb2snUPIJDiyw8nXuzD6gfyIATAlP-9JmEk-INl6iCHluEBeIhI7D2SLcLCzBzue8SeM2WM6Ez2My-TnZSrFGJ7J6uBPifzx-UDWSy7LPJDtnu882cwZYznbjqOHdFu9d3ZMePc_31S_vq5_rr7Xj0_fNquHxxqElrlWjQRQvQYqlbM9x8ZBK7BVjdEcsTVSC9YDVUI63nMKKKzUUlBnXBEN4qbaXHiHYI_dKfrJxucuWN_9G4S472zRAiN2WhkLWspB9VQy50ozMNs6dMoglX3h-nThOsXwe8GUu2NY4lzO77hqtFSMcVNQny-o8w9TRPe6ldHu7F33xjvxF_GrjV8</recordid><startdate>20210901</startdate><enddate>20210901</enddate><creator>Son, Yong Guk</creator><creator>Jung, Sung Soo</creator><creator>Park, Yong Ho</creator><creator>Lee, Young Cheol</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0003-0994-8271</orcidid></search><sort><creationdate>20210901</creationdate><title>Effect of Semi-Solid Processing on the Microstructure and Mechanical Properties of Aluminum Alloy Chips with Eutectic Mg2Si Intermetallics</title><author>Son, Yong Guk ; 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In semi-solid processes, these processing parameters must be optimized because they affect the microstructure and mechanical properties of the chips. In microstructural analysis, these parameters clearly influenced the spheroidization of the aluminum matrix. The aluminum matrix was uniformly spheroidized after semi-solid processing, and the densities of the final samples increased with the holding time. After 30 min holding time at a given temperature, the density approached the theoretical density, but the compressive strength of the samples seriously deteriorated. Meanwhile, fracture surface investigation revealed a deformed Mg2Si phase, which is formed through a eutectic reaction. The strength of this phase significantly decreased after increasing the holding time of the semi-solid processing from 10 to 30 min. Therefore, deformation of the Mg2Si phase caused by diffusion of aluminum into this phase can be a key factor for the decrease in the mechanical properties of samples fabricated with 30 min holding time.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/met11091414</doi><orcidid>https://orcid.org/0000-0003-0994-8271</orcidid><oa>free_for_read</oa></addata></record> |
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| source | DOAJ Directory of Open Access Journals; MDPI - Multidisciplinary Digital Publishing Institute; EZB-FREE-00999 freely available EZB journals |
| subjects | Alloys Aluminum alloys Aluminum base alloys Compressive strength Density Eutectic alloys Eutectic reactions fracture surface Fracture surfaces High strength alloys high-strength aluminum alloy Intermetallic compounds Magnesium compounds Mechanical properties Metal silicides Microscopy Microstructural analysis Microstructure Process parameters semi-solid Semi-solid processing Solidification Solids Spheroidizing Spray forming Theoretical density |
| title | Effect of Semi-Solid Processing on the Microstructure and Mechanical Properties of Aluminum Alloy Chips with Eutectic Mg2Si Intermetallics |
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