| 熔体超声处理对7050铝合金铸锭宏观偏析的影响 |
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| 引用本文： | 黎正华,李晓谦,胡仕成,陈铭.熔体超声处理对7050铝合金铸锭宏观偏析的影响[J].中南大学学报(自然科学版),2011(9). |
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| 作者姓名： | 黎正华 李晓谦 胡仕成 陈铭 |
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| 作者单位： | 中南大学机电工程学院现代复杂装备设计与极端制造教育部重点实验室; |
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| 基金项目： | 国家重点基础研究发展规划(“973”计划)项目(2010CB731700) |
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| 摘 要： | 采用SPECTRO-MAXx立式直读光谱仪和Leica金相显微镜,研究超声外场下7050铝合金半连续铸锭中微观组织的演变规律及溶质元素Zn,Mg和Cu的宏观偏析行为。研究结果表明:熔体超声处理后的铸锭组织变得细小,混晶减少,溶质元素的宏观偏析程度得到弱化,且随着超声功率的增大,溶质元素分布更加均衡,在240 W超声功率作用下,Zn,Mg和Cu的偏析比由未加超声时的1.243,1.158和1.190分别降低为1.086,1.098和1.110;超声外场的引入使得液穴变浅,由铸锭收缩引起的溶质元素在枝晶间的横向流动作用减弱;晶粒的有效细化导致液固两相的相对运动速度减弱;溶质原子的扩散程度得到强化是超声弱化偏析的主要原因。
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| 关 键 词： | 半连铸 宏观偏析 超声功率 偏析比 |
Effect of 7050 aluminum alloy melt treated by ultrasonic on macrosegregation in ingot |
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| LI Zheng-hua,LI Xiao-qian,HU Shi-cheng,CHEN Ming.Effect of 7050 aluminum alloy melt treated by ultrasonic on macrosegregation in ingot[J].Journal of Central South University:Science and Technology,2011(9). |
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| Authors: | LI Zheng-hua LI Xiao-qian HU Shi-cheng CHEN Ming |
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| Institution: | LI Zheng-hua,LI Xiao-qian,HU Shi-cheng,CHEN Ming (Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing,Ministry of Education,School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | The macrosegregation behavior of Zn,Mg,Cu solute elements and evolution of microstructure in 7050 aluminum alloy ingots produced by semi-continuous casting process in the ultrasonic filed was investigated using SPECTRO?MAXx and Leica optic microscopy.The results show that microstructure refines,duplex grains structure consisting of coarse-cell and fine-cell dendritic grains decrease,and so does the segregation grade of solute elements when alloy melt is treated by ultrasonic vibration.With the increase of u... |
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| Keywords: | semi-continuous casting macrosegregation ultrasonic power segregation ratio |
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