【摘要】 采用双流浇注连续铸造方法制备了直径为65mm的7075/6009梯度复合铝合金铸件。分析了不同内浇包熔体温度对铸件横截面上的微观组织、成分分布和性能变化的影响。结果表明:内浇包熔体温度显著影响7075/6009合金的组织和性能,当内浇包熔体温度从680℃升高到730℃时,外层合金平均厚度减少约4.0%;当内熔体温度从730℃升高到780℃时,外层合金的平均厚度减少了25.0%。在内层合金和外层合金之间存在一个Zn、Cu含量和硬度连续降低的梯度过渡层,过渡层宽度随内层合金熔体温度的升高而增大,但增幅很小。更多还原

【Abstract】 A cylindrical ingot with the diameter of 65 mm of 7075/6009 gradient aluminum alloy was prepared by using double-stream-pouring continuous casting technique.The effect of melt temperature in ladle on the microstructure,composition and property in the cross section of the ingot were analyzed.The results show that the melt temperature in the ladle remarkably affects the microstructure and property of the 7075/6009 alloy.When the melt temperature increases from 680℃ to 730℃ and from 730 ℃ to 780℃,the average thickness of external component 6009 alloy in cross section is reduced by 4.0% and 25.0%,respectively.There is a gradient transition zone between the internal component and external component in which zinc,copper concentration and Rockwell hardness decrease continuously.The width of the transition zone increases slightly when the melt temperature in ladle increases.更多还原