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4004铝合金具有良好的可焊性。然而,由于其Si含量较高,在凝固过程中会形成粗大的Si相而降低该合金的塑性,从而降低箔材的成品率。为了提高该合金的塑性和成品率,采用RE-Ba-Sb对4004铝合金进行复合变质处理。作为对比,对该合金亦采用不同含量稀土进行变质处理。对于单一稀土变质处理,当稀土加入量为0.2%时,材料的组织和性能达到最佳,此时材料的的抗拉强度为194 MPa,伸长率为5%。对于RE-Ba-Sb复合变质处理,变质剂的最佳加入量采用正交设计的方法而进行优化。结果表明,RE的加入量影响最大,其次是Ba的加入量,Sb的加入量影响最小。三种元素的最佳加入量分别为RE 0.01%,Ba 0.3%,Sb 0.05%,此时材料的抗拉强度为224 MPa,伸长率为6%。且复合变质中RE的加入量约为单一RE变质加入量的1/20。
4004 aluminum alloy has good solderability. However, due to its high Si content, a coarse Si phase is formed during solidification which reduces the plasticity of the alloy, thereby reducing the yield of the foil. In order to improve the ductility and yield of the alloy, 4004 aluminum alloy was modified by RE-Ba-Sb. As a comparison, the alloy is also modified with different contents of rare earths. For a single modification of rare earths, when the amount of rare earth added was 0.2%, the microstructure and properties of the material reached the best. At this time, the tensile strength of the material was 194 MPa and the elongation was 5%. For the RE-Ba-Sb composite modification, the optimal addition amount of modifier is optimized by orthogonal design. The results show that the amount of RE is the most important, followed by the amount of Ba and the amount of Sb is the least. The optimal loadings of the three elements are RE 0.01%, Ba 0.3% and Sb 0.05%, respectively. At this point, the tensile strength of the material is 224 MPa and the elongation is 6%. The amount of RE added in composite metamorphism is about 1/20 of the amount of single RE metamorphism added.