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용탕단조 Al-Cu-Si-Mg 합금의 열처리시 제2응고상의 분해거동
김유찬,김도향,한요섭,이호인 ( Yu Chan Kim,Do Hyang Kim,Yo Sub Han,Ho In Lee ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.6
N/A The dissolution behavior of secondary solidification phases in squeeze cast Al-3.9wt%Cu-1.5wt%Si-1.0wt%Mg 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 thermal analyzer (DTA). Special emphasis was placed on the investigation of the effects of the nonequilibrium heat treatment on the dissolution of the second solidification phases. Ascast microstructure consisted of primary solidification product of α-Al and secondary solidification products of Al₂Cu, Mg₂Si and Al₂CuMg. Equilibrium and non-equilibrium solution treatments were carried out at the temperatures of 495˚C, 502˚C and 515˚C for 3 to 5 hours. The amount of the dissolved secondary phases increased with increasing solution treatment temperature, for example, area fractions of Al₂Cu, Mg₂Si and Al₂CuMg were approximately 0%, 1.6% and 4.2% after solution treatment at 495˚C for 5 hours, and were approximately 0%, 0.36% and 2% after solution treatment at 515˚C for 5hours. The best combination of tensile properties was obtained when the as-cast alloy was solution treated at 515˚C for 3hours followed by aging at 180˚C for 10 hours. Detailed DTA and TEM study showed that the strengthening behavior during aging was due to enhanced precipitation of the platelet type fine θ` phase. (Received August 23, 1997)
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용탕단조 Al-Cu-Mg (- Ag) 합금의 열처리시 공정응고상의 분해거동
이호인,김도향,김유찬,한요섭 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.5
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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