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研究了机械振动对消失模铸造AlSi9Mg合金组织与性能的影响,并分析了其作用机理。结果表明,Z方向机械振动的AlSi9Mg合金的平均晶粒尺寸最小,布氏硬度、抗拉强度和伸长率最大,其次为XY方向,而X、XZ和XYZ方向振动的AlSi9Mg合金的平均晶粒尺寸稍大,布氏硬度、抗拉强度和伸长率相对较小。随着机械振幅或振动频率的增加,AlSi9Mg合金的平均晶粒尺寸呈现先减小而后增加的趋势,而布氏硬度、抗拉强度和伸长率都呈现为先增加而后降低的趋势。消失模铸造AlSi9Mg合金适宜的机械振动工艺:机械振动方向为Z向,机械振幅为0.10mm,机械振动频率为36 Hz,在此工艺下可以获得较好的强度与塑性。
The effect of mechanical vibration on the microstructure and properties of AlSi9Mg alloy during lost foam casting was studied and its mechanism was analyzed. The results show that the average grain size of AlSi9Mg alloy with Z-direction mechanical vibration is the smallest, the Brinell hardness, tensile strength and elongation are the largest, followed by XY direction, and the average grain size of AlSi9Mg alloy vibrating in X, XZ and XYZ directions Slightly larger, Brinell hardness, tensile strength and elongation are relatively small. With the increase of mechanical amplitude or vibration frequency, the average grain size of AlSi9Mg alloy first decreases and then increases, while the Brinell hardness, tensile strength and elongation show a trend of first increasing and then decreasing. Lost Foam Casting AlSi9Mg alloy suitable mechanical vibration process: mechanical vibration direction is Z direction, mechanical amplitude is 0.10mm, mechanical vibration frequency is 36Hz, in this process can get better strength and plasticity.