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Kotadia, HR, Qian, M and Das, A (2020) Microstructural modification of recycled aluminium alloys by high-intensity ultrasonication: Observations from custom Al–2Si–2Mg–1.2Fe–(0.5,1.0)Mn alloys. Journal of Alloys and Compounds, 823. ISSN 0925-8388
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Microstructural modification of recycled aluminium alloys by high-intensity ultrasonication observations from custom Al-2Si-2Mg-1.2Fe-(0.5,1.0)Mn alloys.pdf - Accepted Version Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (3MB) | Preview |
Abstract
The effect of ultrasonication on the solidification microstructure of recycled Al-alloys is investigated using custom Al–2Si–2Mg–1.2Fe–xMn alloys (x = 0.5 and 1%, in wt.%) through cooling curve measurement, optical and electron microscopy, X-ray diffraction, differential scanning calorimetry and computational thermodynamic calculations. Applying ultrasonication throughout the primary-Al nucleation stage resulted in refined non-dendritic grain structure. Cooling curves indicate a noticeable reduction in primary-Al nucleation undercooling and reduction of the recalescence peak under ultrasonication. However, terminating ultrasonication prior to the nucleation of primary-Al led to dendritic grains with marginal refinement. Without ultrasonication, coarse Chinese-script α−Al15(Fe,Mn)3Si2 intermetallics developed from initially polygonal particles due to interface growth instability under thermo-solutal undercooling. In contrast, ultrasonication produced refined and polygonal α−Al15(Fe,Mn)3Si2 particles by promoting nucleation and growth stabilisation under strong fluid flow. The enhanced nucleation from ultrasonication is presumably due to the pressure-induced shift of freezing point along with improved wetting of insoluble inclusions under cavitation. The present results show that ultrasonication can effectively modify the Fe-intermetallics and refine the grain structure in recycled Al-alloys.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0204 Condensed Matter Physics; 0912 Materials Engineering; 0914 Resources Engineering and Extractive Metallurgy; Materials |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Engineering |
| Publisher: | Elsevier |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 27 Jan 2025 13:11 |
| Last Modified: | 27 Jan 2025 13:15 |
| DOI or ID number: | 10.1016/j.jallcom.2020.153833 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/25436 |
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