Synergistic Effect of Sr and Ca Combined Additions on the Microstructure of A390 Aluminum Alloy

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-11-01 DOI:10.1016/S1875-5372(18)30236-4

Zhang Jiahong , Xing Shuming , Han Qingyou , Guo Qiang , Wang Rufen

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引用次数: 1

Abstract

Effects of Sr and Ca combined additions (Sr+Ca=0.05wt/%) on the microstructure of A390 aluminum alloy were evaluated by investigating the variation of quantity, size and shape of primary silicon, eutectic silicon, primary α phase and intermetallic phase. The results show that the variation of microstructures results from the synergistic effect of Sr-Ca additions. The loss rate of Sr is reduced with a small amount of Ca; meanwhile, the coarsening effect of primary silicon phase arising from Sr addition is also suppressed. The Sr in A390 aluminum alloy mainly modifies eutectic silicon phase and refines θ phase. Furthermore, Ca principally modifies primary silicon phase and primary α phase. The optimal microstructure is obtained when combined addition of 0.05%Sr-Ca is applied and the atomic ratio of Sr and Ca is 5:1, in which primary silicon phase and eutectic silicon phase as well as primary α phase are all modified significantly compared with those of only 0.05% Sr addition.

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Sr和Ca复合添加剂对A390铝合金组织的协同作用

通过观察初生硅、共晶硅、初生α相和金属间相数量、尺寸和形状的变化，评价了Sr+Ca复合添加(Sr+Ca=0.05wt/%)对A390铝合金显微组织的影响。结果表明，Sr-Ca添加量的协同作用导致了微观结构的变化。少量Ca的加入降低了Sr的损失率;同时，Sr的加入对初生硅相的粗化作用也被抑制。Sr在A390铝合金中的作用主要是改变共晶硅相，细化θ相。Ca主要改变初生硅相和初生α相。当Sr与Ca的原子比为5:1时，复合添加0.05%Sr-Ca获得了最佳的微观结构，其中初生硅相、共晶硅相以及初生α相均比仅添加0.05%Sr时得到了显著的改性。

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