Voids formed from solidifying tin particles in solid aluminium |
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| Authors: | L. Bourgeois G. Bougaran J.F. Nie B.C. Muddle |
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| Affiliation: | 1. Monash Centre for Electron Microscopy, Monash University , Victoria 3800, Australia;2. ARC Centre of Excellence for Design in Light Metals, Monash University , Victoria 3800, Australia;3. Department of Materials Engineering , Monash University , Victoria 3800, Australia laure.bourgeois@mcem.monash.edu.au;5. ARC Centre of Excellence for Design in Light Metals, Monash University , Victoria 3800, Australia;6. Department of Materials Engineering , Monash University , Victoria 3800, Australia;7. Departement Sciences des Matériaux , Polytech’ Nantes, Université de Nantes , Nantes, France;8. Department of Materials Engineering , Monash University , Victoria 3800, Australia |
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| Abstract: | In this study, voids commonly associated with tin particles in two aluminium alloys containing microalloying additions (0.01 at.%) of tin have been observed by transmission electron microscopy. The voids were generated by quenching the alloys at moderate rates (102–103 K s?1) from a temperature (718 K) in excess of the melting temperature (501 K) of elemental tin in tin–microalloyed aluminium. Estimates of the void volume as a function of the volume of the associated tin particle reveal a linear relationship consistent with the excess volume resulting from the solidification of the tin particle. The formation and stabilisation of shrinkage voids in metallic alloys are suggested to arise from a combination of high vacancy supersaturation, the large volumetric misfit strain of the solidifying tin particle and a reduction in void surface energy associated with segregation of alloying elements. |
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| Keywords: | voids aluminium alloys transmission electron microscopy nucleation segregation |
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