【摘 要】
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The effects of Mg content and cooling rate on the solidification behaviour of Al-7 % Si-Mg(mass fraction)casting alloys have been investigated using differentia
【机 构】
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State Key Laboratory of Solidification Processing
论文部分内容阅读
The effects of Mg content and cooling rate on the solidification behaviour of Al-7 % Si-Mg(mass fraction)casting alloys have been investigated using differential scanning calorimetry,differential thermal analysis and microscopy.The Mg contents were selected as respectively 0.00%,0.35% and 0.70% (mass fraction).DTA curves of Al-7%Si-0.55%Mg(mass fraction) alloy at various cooling rates were accomplished and the alloy melt was cast in different cooling rates.The results indicate that increasing Mg content can lower the liquidus and binary Al-Si eutectic transformation temperatures.Large Fe-rich π-phases (Al8 FeMg3 Si6) are found in the 0.70 % Mg alloys together with some small β-phases (Al5 FeSi);in contrast,only β-phases are observed in the 0.35 % Mg alloys.The test results of the Al-7%Si-0.55%Mg alloys identify that the liquidus and binary Al-Si eutectic transformation temperatures decrease,and the quantity of ternary Al-Si-Mg2 Si eutectic phase decreases as the cooling rate increases.
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