Al-1.0 % Mg2Si의 이원계합금의 G. P. Zone 형성과 시효석출에 미치는 Fe 첨가의 영향 = Effects of Additional Element Fe on G . P . Zone Formation and Ageing Precipitation in Al-1.0% Mg2Si Pseudo Binary Alloy

국문 초록 (Abstract)

Al-1.0% Mg₂Si 擬二元系合金에 微量(0.05∼0.16%)의 Fe를 첨가하여 G.P. zone형성과 각종 時效擧動을 硬度 및 電氣抵抗 測定에 의해서 檢討한 결과 다음과 같았다.
(1) 低溫時效에서는 G.P. zone의 형성이 지연되었고 高溫時效에서는 G.P. zone의 형성 없이 析出反應만이 빠르게 일어났다.
(2) G.P. zone의 臨界溫度는 208℃였고 Fe첨가에 의해 그 臨界溫度는 낮아져서 0.16% Fe 첨가시 160℃였다.
(3) 時效初期의 硬度置는 Fe첨가에 의해 약간 증가되었다.
이상의 결과는 溶體化處理溫度에서도 용해되지 않은 一部의 Fe化合物이 有效 vacancy 농도와 有效 용질원자 농도를 감소시키고 析出物의 성장을 촉진시키기 때문이다.

다국어 초록 (Multilingual 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.