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Original Articles

Investigation of the crystallography and morphology of the S′ precipitate in an Al(CuMg) alloy by HREM

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Pages 265-271 | Received 18 Jan 1989, Accepted 24 Feb 1989, Published online: 02 Sep 2006
 

Abstract

The crystal lattice of the S′ phase in a 2024 aluminium alloy with 4·43 wt% Cu and 2·00 wt% Mg, and the precipitate–matrix orientation relationship are directly illustrated by the [100] lattice image of both the S′ and matrix phases. Two types of the precipitation morphology of the S′ phase, which correspond to homogeneous and preferential nucleation respectively, are also shown.

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