발간논문

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Vol.31, No.8, 1087 ~ 1094, 1993
Title
Effect of Cu and Mg on the Coarsening Behavior of δ' Phase in Al - Li Based Alloys
김제덕J . D . Kim, 정우상W . S . Jung, 박중근J . K . Park, 신명철M . C . Shin
Abstract
The coarsening behavior of δ′(AI₃Li) phase has been studied in various alloys of Al-Li, Al-Li-Cu and Al-Li-Cu-Mg systems using transmission electron microscopy. The coarsening kinetics are well governed by Ostwald ripening theory in all cases. The ccarsening rate depends sensitively on the volume fraction of δ′ phase particulary in binary system, which conforms relatively well to the MLSW theory. The addition of Cu in Al-Li binary alloy ○ds to accelerate the coarsening rate of δ′ phase. This is believed to be due to the variation of δ′ interfacial energy. The addition of Mg in Al-Li-Cu ternary alloy tends to reduce the δ′ coarsening rate. This is because the precipitation of S′ phase has an effect to reduce the diffusivity of Li atom by depleting the concentration of vacancy.
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