발간논문

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Vol.36, No.5, 640 ~ 647, 1998
Title
Dissolution of the eutectic solidification phase in squeeze casting Al - Cu - Mg ( - Ag ) alloys
김유찬 , 김도향 , 한요섭 , 이호인 Yu Chan Kim , Do Hyang Kim , Yo Sub Han , Ho In Lee
Abstract
The dissolution behavior of secondary solidification phases in squeeze cast Al-4wt%Cu-1.5wt%Mg and Al-4wt%Cu-1.5wt%Mg-0.7wt%Ag has been studied using a combination of optical microscope, image analyzer, scanning electron microscope(SEM), energy dispersive spectrometer(EDS). X-ray diffractometer(XRD) and differential scanning calorimeter(DSC). Special emphasis was placed on the investigation of the effects of the non-equilibrium heat treatment on the dissolution of the second solidification phases, As-cast microstructure consisted of primary solidification product of α-Al and various types of secondary solidification phases such as Al₂Cu. Al₂CuMg and AlMgAg. Detailed thermal analysis showed that various types of dissolution occurred depending on the alloy composition. Based on the results from DSC, the effects of equilibrium and non-equilibrium solution treatments have been discussed. The volume fractions of the secondary phases decreased approximately from 27.3 to 11.6% after equilibrium solution treatment at 495℃ for 5hours and from 27.3% to 5.4% after non-equilibrium solution treatment at 515℃ for 5hours in Al-4wt%Cu-1.5wt%Mg-0.7wt%Ag. Non-equilibrium solution treatment resulted in higher hardness value than equilibrium solution treatment.
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