Microstructures and mechanical properties of die-cast Mg-5Al-xSi magnesium alloys

作者：Zhang Yunlong^*; Liu Liufa; Wei Zhongshan; Lu Chen

来源：Rare Metal Materials and Engineering, 2006, 35(11): 1813-1816.

• magnesium alloys
• die cast
• silicon

The effects of silicon on microstructures, fluidity, mechanical proper-ties and fracture behaviors of AM50 magnesium alloy under die cast conditions were studied by making die cast samples with silicon contents of 0.5wt%, 0.93wt% and 1.91wt%. Mg2Si phases with two kinds of morphologies in Si containing alloy, i.e. square-like and 'Chinese script was observed'. Both fluidity and hardness of the alloy can be improved by silicon. However, silicon is detrimental to the mechanical properties at room temperature when its content is more than 0.93wt%. The fracture of the alloys was observed to be in brittle cleavage or quasi-cleavage failure mode. Silicon is detrimental to the impact toughness of AM50 alloy.

• 出版日期2006-11
• 单位上海交通大学