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- W4385781269 abstract "Voids can be detrimental to the mechanical and electrical properties of materials but may also find applications in catalysis and plasmonics. Key to materials performance is the sizes and morphologies of the voids, which can be tuned by heat treatment. The present work investigates the morphological evolutions of voids, with solute segregation at their surfaces, in an aluminium alloy during in situ heating transmission electron microscopy (TEM). Without electron irradiation, the voids never grew. Nearly one-fourth of the voids grew under certain heating and electron irradiation conditions, showing distinct growth stages that are more complex than a model simply controlled by energetics and kinetics. Growth and shrinkage of the voids both occurred primarily along the edge of the Sn particles that they are attached to. The voids exhibited faceting as they grew and gained morphological isotropy while they shrank. The growth and shrinkage fronts were both found to be primarily the curved surfaces and not the facets at the void surfaces. Growth followed by shrinkage led to a well-defined rounded triangular shape with smooth boundaries. The dual effects of heating and electron irradiation could be utilised to switch the voids between growing and shrinking to manipulate the void size and shape. The controllable nature of the voids lends versatility to the material. This work provides useful insights into tuning void morphologies in the development of advanced materials for different purposes." @default.
- W4385781269 created "2023-08-13" @default.
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- W4385781269 date "2023-08-01" @default.
- W4385781269 modified "2023-10-17" @default.
- W4385781269 title "WITHDRAWN: In situ growth and shrinkage of coated voids in aluminium" @default.
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- W4385781269 doi "https://doi.org/10.1016/j.jmst.2023.06.045" @default.
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