발간논문

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Vol.11, No.1, 17 ~ 24, 1973
Title
Effects of Additional Element Fe on G . P . Zone Formation and Ageing Precipitation in Al - 1.0% Mg2Si Pseudo Binary Alloy
조현기Hyun Kee Cho, 윤병하Byung Ha Yoon, 정인상In Sang Chung
Abstract
The effects of additional clement Fe in the range of 0.05-0.16% on G.P. zone formation and ageing phenomena in Al-1.0% Mg₂Si pseudo binary alloy were investigated by means of Vickers microhardness and electrical resistivity measurement. The results obtained were summarized as follows: (1) The G.P. zone formation was delayed in low temperature ageing and the rate of precipitation was increased without G.P. zone formation in high temperature ageing by the additional element Fe. (2) The critical temperature of G.P. zone was 208℃, and it was dropped down by the effect of additional element Fe as 160℃ at the 0.16% Fe content. (3) The hardness of specimens added element Fe were a little higher than that of matrix alloy in the initial ageing time. The above results can be explained by the facts that Fe compounds in the alloy undisolved even at solution treatment temperature decreases the concentration of effective vacancy and solute atom, and also accelerate the growth of precipitate in the alloy.
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