Understanding the refinement of grains in laser surface remelted Al–Cu alloys

The coarse-grained microstructure of laser surface remelted (LSR) Al–x wt.%Cu (x = 2, 5 & 7) is significantly refined by Al–3Ti–1B grain refiner. Epitaxial columnar grain growth at the melt pool boundary is suppressed. A reduction in grain size of about 80% is achieved and more than 25% of added...

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Bibliographic Details
Published in:Scripta materialia 2020-03, Vol.178, p.447-451
Main Authors: Patel, M.N., Qiu, D., Wang, G., Gibson, M.A., Prasad, A., StJohn, D.H., Easton, M.A.
Format: Article
Language:English
Subjects:
Aluminium alloys
Grain refining
Nucleation free zone
Rapid solidification
Solidification microstructure
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Summary:The coarse-grained microstructure of laser surface remelted (LSR) Al–x wt.%Cu (x = 2, 5 & 7) is significantly refined by Al–3Ti–1B grain refiner. Epitaxial columnar grain growth at the melt pool boundary is suppressed. A reduction in grain size of about 80% is achieved and more than 25% of added TiB2 particles appear to be activated compared to less than 0.1% being activated during casting. The increased nucleation rate is explained in terms of an increase in thermal undercooling, activating a larger number of nucleants of lower potencies, and a reduction in the size of the nucleation free zone. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.12.020