摘要
提出将扰流冷却技术应用于半固态合金制备中,在自制的倾斜冷却装置内安放扰流柱,制备半固态AlSi9Mg合金水淬试样,用定量分析技术分析试样组织,研究扰流柱形状、排列方式和排列间距对半固态AlSi9Mg合金组织的影响.结果表明:扰流柱为水滴形时,制备的半固态AlSi9Mg合金中初生α-Al相较多,组织均匀,边缘轮廓清晰,初生α-Al相为球形或近球形,水淬组织特征为初生固相率53.54%,晶粒尺寸5.59μm,形状因子0.61.扰流柱的排列方式和排列间距对半固态Al-Si9Mg合金组织有较大的影响,叉排优于顺排,理想的排列间距为行间距S=15 mm,列间距L=40 mm.
A burbling cooling technique used for preparing semi-solid alloys was presented.Water quenching specimens made of semi-solid AlSi9Mg alloy were prepared by which pin fins were put into a homemade sloping cooling device.The microstructures of the specimens were analyzed by the quantitative analysis technique.The influence of the shape,arrayed mode and arrayed pitch of pin fins on the microstructure of semi-solid AlSi9Mg alloy was studied.It is revealed that when the sectional shape of pin fins is water drop shaped,more α-Al phases with homogeneous microstructure and clear outline are obtained in the semi-solid alloy melt,showing spherical or nearly spherical shapes.The water quenching characteristics are the primary solid rate of 53.54%,the grain size of 5.59 μm and the shape factor of 0.61.Different arrayed modes and different arrayed pitches of pin fins have great influence on the microstructure of the semi-solid AlSi9Mg alloy melt.The cross array has more advantages over the order array under the same conditions,and the ideal spacing is the one with line spacing S=15 mm and column spacing L=40 mm.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第10期1243-1247,共5页
Journal of University of Science and Technology Beijing
基金
河北省自然科学基金资助项目(E2010000880)
河北科技大学博士基金资助项目(QD200901)
关键词
铝合金
半固态
凝固
扰流柱
显微结构
aluminum alloys
semi-solid
solidification
pin fins
microstructure
