Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr
Due to the Si/Zr-poisoning effect, conventional refiners often yield unsatisfactory results in refining α-Al grains for Al–Si alloys. In this work, the refinement of α-Al grains and the modification of eutectic Si are simultaneously achieved through the combined addition of Y and Zr to A356 alloy. T...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424007488 |
| _version_ | 1827216712063254528 |
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| author | Xiaogang Fang Tianyang Zhang Buke Dong Ziyun Yuan Zhongyue Huang Feng Yan Fangqiu Zu |
| author_facet | Xiaogang Fang Tianyang Zhang Buke Dong Ziyun Yuan Zhongyue Huang Feng Yan Fangqiu Zu |
| author_sort | Xiaogang Fang |
| collection | DOAJ |
| description | Due to the Si/Zr-poisoning effect, conventional refiners often yield unsatisfactory results in refining α-Al grains for Al–Si alloys. In this work, the refinement of α-Al grains and the modification of eutectic Si are simultaneously achieved through the combined addition of Y and Zr to A356 alloy. The results indicate that the individual addition of Zr aids in refinement due to the formation of heterogeneous nuclei Al3Zr, while Y alone can refine α-Al grains and modify eutectic Si to a certain extent. When Y and Zr are added together, not only is the size of α-Al grains further refined to 22.1 μm, but the morphology of eutectic Si is also completely transformed into a fibrous structure. The interaction between Zr and Y decreases their solubility in the matrix, enhances heterogeneous nucleation, and induces the formation of a Al8FeMg3Si6YxZry phase enriched at grain boundaries, suppressing the growth of eutectic Si flakes. Compared to the use of Al–Ti–B refiners and Sr modifiers, the alloy with 0.25Zr and 0.3Y additions exhibits more significant grain refinement and Si modification. Furthermore, it facilitates the precipitation of fine Al3(Y, Zr) particles during the T6 heat treatment process, resulting in an optimal ultimate tensile strength (UST) of 289 MPa and an elongation of 9.75%. |
| first_indexed | 2024-04-24T14:28:32Z |
| format | Article |
| id | doaj.art-fd481c9c8dc9436598ee5ac9210b2714 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2025-03-21T15:07:28Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-fd481c9c8dc9436598ee5ac9210b27142024-06-20T06:53:07ZengElsevierJournal of Materials Research and Technology2238-78542024-05-013018221833Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and ZrXiaogang Fang0Tianyang Zhang1Buke Dong2Ziyun Yuan3Zhongyue Huang4Feng Yan5Fangqiu Zu6School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Ministry of Education for High Performance Copper Alloy Materials and Forming, Hefei, 230009, China; Corresponding author. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China.School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Ministry of Education for High Performance Copper Alloy Materials and Forming, Hefei, 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Ministry of Education for High Performance Copper Alloy Materials and Forming, Hefei, 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Ministry of Education for High Performance Copper Alloy Materials and Forming, Hefei, 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Ministry of Education for High Performance Copper Alloy Materials and Forming, Hefei, 230009, ChinaHefei Qiming New Material Technology Development Co., Ltd., Hefei, 230031, ChinaSchool of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Ministry of Education for High Performance Copper Alloy Materials and Forming, Hefei, 230009, China; Corresponding author. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China.Due to the Si/Zr-poisoning effect, conventional refiners often yield unsatisfactory results in refining α-Al grains for Al–Si alloys. In this work, the refinement of α-Al grains and the modification of eutectic Si are simultaneously achieved through the combined addition of Y and Zr to A356 alloy. The results indicate that the individual addition of Zr aids in refinement due to the formation of heterogeneous nuclei Al3Zr, while Y alone can refine α-Al grains and modify eutectic Si to a certain extent. When Y and Zr are added together, not only is the size of α-Al grains further refined to 22.1 μm, but the morphology of eutectic Si is also completely transformed into a fibrous structure. The interaction between Zr and Y decreases their solubility in the matrix, enhances heterogeneous nucleation, and induces the formation of a Al8FeMg3Si6YxZry phase enriched at grain boundaries, suppressing the growth of eutectic Si flakes. Compared to the use of Al–Ti–B refiners and Sr modifiers, the alloy with 0.25Zr and 0.3Y additions exhibits more significant grain refinement and Si modification. Furthermore, it facilitates the precipitation of fine Al3(Y, Zr) particles during the T6 heat treatment process, resulting in an optimal ultimate tensile strength (UST) of 289 MPa and an elongation of 9.75%.http://www.sciencedirect.com/science/article/pii/S2238785424007488Al-Si alloyGrain refinementSi modificationMechanical properties |
| spellingShingle | Xiaogang Fang Tianyang Zhang Buke Dong Ziyun Yuan Zhongyue Huang Feng Yan Fangqiu Zu Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr Journal of Materials Research and Technology Al-Si alloy Grain refinement Si modification Mechanical properties |
| title | Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr |
| title_full | Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr |
| title_fullStr | Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr |
| title_full_unstemmed | Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr |
| title_short | Simultaneous refinement of α-Al and modification of Si in Al–Si alloy achieved via the addition of Y and Zr |
| title_sort | simultaneous refinement of α al and modification of si in al si alloy achieved via the addition of y and zr |
| topic | Al-Si alloy Grain refinement Si modification Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424007488 |
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