Achieving dispersed fine soft Bi particles and grain refinement in a hypermonotectic Al–Bi alloy by severe plastic deformation and annealing

The present work revealed that equal-channel angular pressing (ECAP) deformation combined with appropriate annealing could represent as an efficient route to modify immiscible as-cast microstructure of a monotectic Al–8Bi alloy by a complete redistribution of immiscible Bi particles and grain refine...

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Bibliographic Details
Published in:Scripta materialia 2018-10, Vol.155, p.124-128
Main Authors: Zha, Min, Yu, Zhi-Yuan, Qian, Feng, Wang, Hui-Yuan, Li, Yan-Jun, Mathiesen, Ragnvald H., Roven, Hans J.
Format: Article
Language:English
Subjects:
Al–Bi alloys
ECAP
Microstructure
Particle dispersion
Recrystallization
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Summary:The present work revealed that equal-channel angular pressing (ECAP) deformation combined with appropriate annealing could represent as an efficient route to modify immiscible as-cast microstructure of a monotectic Al–8Bi alloy by a complete redistribution of immiscible Bi particles and grain refinement of alloy matrix. Especially, we found that the mean size of Bi particles in the 4-pass ECAPed Al–8Bi sample decreases after annealing at 200 °C for 8 h, due to inverse coarsening driven by the reduction of elastic energy and interfacial energy induced by morphology change and spatial distribution of Bi particles. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.06.029