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Formation of locked-lamellar grains in a slightly hypoeutectic Al-Al2Cu alloy during thin-sample directional solidification

Abstract : We studied the formation and growth of locked-lamellar microstructures in a thin sample of a slightly hypoeutectic Al-Al2Cu alloy. The coupled-growth dynamics, including early stages and steady-state regimes, was observed optically in real time during directional solidification. The orientation of the a (Al) and q (Al2Cu) crystals was measured ex situ in a series of eutectic grains by X-ray Laue microdiffraction. A nucleation event of a q crystal on a pre-existing a crystal, and the subsequent growth of a eutectic grain with a type-C orientation relationship, that is, with a coincidence of {123}-a and {100}-q planes, were observed in situ. In type-C eutectic grains, lamellar locking occurred parallel to the low-energy coincidence plane. A regular (floating) coupled-growth dynamics was observed in misoriented eutectic grains.
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https://hal.archives-ouvertes.fr/hal-03777032
Contributor : Silvère Akamatsu Connect in order to contact the contributor
Submitted on : Wednesday, September 14, 2022 - 11:33:21 AM
Last modification on : Friday, September 16, 2022 - 3:39:15 AM

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  • HAL Id : hal-03777032, version 1

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M Medjkoune, S Bottin-Rousseau, L Carroz, G Prévot, B Croset, et al.. Formation of locked-lamellar grains in a slightly hypoeutectic Al-Al2Cu alloy during thin-sample directional solidification. {date}. ⟨hal-03777032⟩

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