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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.1
- 수록면
- 72 - 78 (7page)
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In foundry practice, ultrasonic treatment has been used as an efficient technique to achieve grain refinementin aluminium and magnesium alloys. This article shows the strong effect of pouring temperature and ultrasonictreatment at various temperatures on the grain refinement of Al-1 wt% Mg-0.3 wt% Sc alloy. Without ultrasonictreatment, a fine grain structure was obtained at the pouring temperature of 700 °C. The average grain sizesharply decreases from 487 ± 20 to 103 ± 2 μm when the pouring temperature decreases from 800 to 700 °C.
Ultrasonic vibration proved to be a potential grain refinement technique with a wide range of pouring temperature.
A microstructure with very fine and homogeneous grains was obtained by applying ultrasonic treatmentto the melt at the temperature range between 700 and 740 °C, before pouring. Cavitation-enhanced heterogeneousnucleation is the mechanism proposed to explain grain refinement by ultrasound in this alloy. Moreover,ultrasonic treatment of the melt was found to lead to cast samples with hardness values similar to those obtainedin samples submitted to precipitation hardening, suggesting that ultrasonic treatment can avoid carrying out heattreatment of cast parts.
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