Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향 (Effect of Solution Temperature and Quench Delay on the Microstructure and Mechanical Properties of an Extruded Al-Mg-Si-Cu-Mn alloy)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 62권 / 2호 / 132 ~ 141페이지
· 저자명 : 김지수, 정제기, 천현석, 김병주, 임차용, 김수현, 최윤석

초록

The effect of solution temperature and quench delay on the microstructure and mechanicalproperties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanningcalorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens wereheld at 500 and 540 oC, respectively, for 80 min for solutionizing and then immediately quenched in water orexposed to air for 30 sec before water quenching. Each specimen was further heat treated at 180 oC for 6 hrfor artificial aging. Quantitative analysis of the precipitates in the artificially aged specimens was performedusing high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) and fastFourier transforms (FFT) analysis. Solution treatment at 540 oC led to higher number density of precipitatesand higher strengths after artificial aging, compared with solution treatment at 500 oC. Quench delay resultedin a lower number density of precipitates and lower strengths after artificial aging. The specimen solutiontreated at 540 oC with no quench delay showed the largest peak area of precipitate formation in the differentialscanning calorimetry, and concurrently exhibited the highest strengths after artificial aging. Strengthreduction by quench delay was higher in the specimen solution treated at 500 oC than that treated at 540 oC;this was consistent with the results of higher reduction in the number density of precipitates.

영어초록

The effect of solution temperature and quench delay on the microstructure and mechanicalproperties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanningcalorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens wereheld at 500 and 540 oC, respectively, for 80 min for solutionizing and then immediately quenched in water orexposed to air for 30 sec before water quenching. Each specimen was further heat treated at 180 oC for 6 hrfor artificial aging. Quantitative analysis of the precipitates in the artificially aged specimens was performedusing high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) and fastFourier transforms (FFT) analysis. Solution treatment at 540 oC led to higher number density of precipitatesand higher strengths after artificial aging, compared with solution treatment at 500 oC. Quench delay resultedin a lower number density of precipitates and lower strengths after artificial aging. The specimen solutiontreated at 540 oC with no quench delay showed the largest peak area of precipitate formation in the differentialscanning calorimetry, and concurrently exhibited the highest strengths after artificial aging. Strengthreduction by quench delay was higher in the specimen solution treated at 500 oC than that treated at 540 oC;this was consistent with the results of higher reduction in the number density of precipitates.

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