| Autor: |
Medjkoune, M, Bottin-Rousseau, S, Carroz, L, Prévot, G, Croset, B, Micha, J S, Akamatsu, S |
| Zdroj: |
IOP Conference Series: Materials Science and Engineering; January 2023, Vol. 1274 Issue: 1 p012037-012037, 1p |
| Abstrakt: |
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 α (Al) and θ (Al2Cu) crystals was measured ex situ in a series of eutectic grains by X-ray Laue microdiffraction. A nucleation event of a θ crystal on a pre-existing α crystal, and the subsequent growth of a eutectic grain with a type-C orientation relationship, that is, with a coincidence of {123}-α and {100}-θ 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. |
| Databáze: |
Supplemental Index |
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