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Article Abstract
The plate-like iron-rich intermetallic phases in recycled aluminum alloys significantly deteriorate the mechanical properties. In this paper, the effects of mechanical vibration on the microstructure and properties of the Al-7Si-3Fe alloy were systematically investigated. Simultaneously, the modification mechanism of the iron-rich phase was also discussed. The results indicated that the mechanical vibration was effective in refining the α-Al phase and modifying the iron-rich phase during solidification. The forcing convection and a high heat transfer inside the melt to the mold interface caused by mechanical vibration inhibited the quasi-peritectic reaction: L + α-AlFeSi → (Al) + β-AlFeSi and eutectic reaction: L → (Al) + β-AlFeSi + Si. Thus, the plate-like β-AlFeSi phases in traditional gravity-casting were replaced by the polygonal bulk-like α-AlFeSi. As a result, the ultimate tensile strength and elongation were increased to 220 MPa and 2.6%, respectively.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004486 | PMC |
| http://dx.doi.org/10.3390/ma16051963 | DOI Listing |
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