발간논문

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Vol.36, No.1, 13 ~ 19, 1998
Title
Analysis of the δ-G . P . Zone Complex Precipitate in an Al-Li-Cu-Mg-Zr Alloy by Using High Resolution Electron Microscopy
이영호 , 이갑호 Young Ho Lee , Kap Ho Lee
Abstract
High resolution transmission electron microscopy(HRTEM) was used to investigate the atomic structure of the δ-G.P. zone complex precipitate which forms in an Al-Li-Cu-Mg-Zr alloy. In the alloy quenched from 530℃, the L12-type microdomains with 2-3㎚ in sine are homogeneously observed in disordered matrix. The δ-G.P. I zone complex precipitate is formed by nucleation of δ on both faces of G.P. I zone plate during aging at 190℃. The interphase boundary at the plate faces is atomically flat and coherent with the surrounding δ phase. The δ phase on the top face of the G.P. I zone is translated exactly one half of the unit cell dimension with respect to the δ phase on the bottom face of the G.P. I zone. This forms an antiphase boundary(APB) in the δ phase across the G.P. I zone and the δ appears to form such that Li atoms are adjacent to Cu atoms in the G.F. I zone. The preferred formation of this configuration can be explained by considering the bond energies among Al, Li and Cu atoms.
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