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Vol.20, No.6, 493 ~ 500, 1982
Title
Effects of Cu / Mg Ratio on Precipitation Behaviors in Al - 3 wt% ( Cu+Mg ) Alloy
조현기 Hyun Kee Cho
Abstract
An investigation has been carried out for the effects of Cu/Mg ratio of solute atom on precipitation behaviors in Al-3wt%(Cu＋Mg) alloy, by the observation of the transmission election microscopy and the detailed measurement of specific heat during ageing at 150˚and 200℃. The results obtained are summerized as follows. 1) The rate of formation and precipitation for the GPB zones and S` metastable phase is accelerated by the increasing of Cu/Mg solute atom ratio at the upper range of 1.0. From this result, it is considered that the Cu/Mg solute atom ratio of 1.0 for the GPB zones and S` metastable phase is almost the same as that for the specimen alloy which is in the dual phase regions of (α＋S). 2) θ` phase has been precipitated with S` phase in the alloy of solute atom ratio of Cu/Mg ≒ 2.4 and isomorphous T` phase has been also precipitated with S` phase in the alloy of solute atom ratio of Cu/Mg ≒ 0.2, after aged at 200℃. 3) The starting and finishing temperature for recovery of GPB zones in Al-3wt%(Cu＋Mg) alloy increased with decreasing of Cu/Mg solute atom ratio. This result means that the growth rate of GPB zones are accelerated by the increasing of Mg atoms.
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