The effects of different cooling conditions on the mechanical properties and microstructures of a Sr-modified A356 （Al-7Si-0.3Mg） aluminum casting alloy were comparatively investigated using three moulding sands inc...The effects of different cooling conditions on the mechanical properties and microstructures of a Sr-modified A356 （Al-7Si-0.3Mg） aluminum casting alloy were comparatively investigated using three moulding sands including quartz, alumina and chromite into multi-step blocks. The results show that the mechanical properties and microstructures using chromite sand are the best. As the cooling speed increases, the dendrite arm spacing （DAS） decreases significantly and the mechanical properties are improved, and the elongation is more sensitive to the cooling speed as compared with the tensile strength. The increase of the properties is primarily attributed to the decrease of the DAS and the increase of the free strontium atoms in the matrix. In particular, the regression models for predicting both the tensile strength and the elongation for Sr-modified A356 aluminum casting alloy were established based on the experimental data.展开更多
美国铸造协会(AFS)团体成员美国黄铜和铝铸件制造公司(Brass and Aluminum Foundry Inc.,MBAF)占地面积35000平方英尺(3252m^2),该铸造厂自1927年以来一直是黄铜、青铜和铝合金砂型铸件的供应商,客户涉及食品加工、玻璃成形、高压电器...美国铸造协会(AFS)团体成员美国黄铜和铝铸件制造公司(Brass and Aluminum Foundry Inc.,MBAF)占地面积35000平方英尺(3252m^2),该铸造厂自1927年以来一直是黄铜、青铜和铝合金砂型铸件的供应商,客户涉及食品加工、玻璃成形、高压电器等多个行业。随着硅砂采购、运输、搬运和处置成本的增加,该厂寻求降低成本的方法。展开更多
基金Project (50971087) supported by the National Natural Science Foundation of ChinaProject (11JDG070) supported by the Senior Talent Research Foundation of Jiangsu University, China
文摘The effects of different cooling conditions on the mechanical properties and microstructures of a Sr-modified A356 （Al-7Si-0.3Mg） aluminum casting alloy were comparatively investigated using three moulding sands including quartz, alumina and chromite into multi-step blocks. The results show that the mechanical properties and microstructures using chromite sand are the best. As the cooling speed increases, the dendrite arm spacing （DAS） decreases significantly and the mechanical properties are improved, and the elongation is more sensitive to the cooling speed as compared with the tensile strength. The increase of the properties is primarily attributed to the decrease of the DAS and the increase of the free strontium atoms in the matrix. In particular, the regression models for predicting both the tensile strength and the elongation for Sr-modified A356 aluminum casting alloy were established based on the experimental data.
文摘美国铸造协会(AFS)团体成员美国黄铜和铝铸件制造公司(Brass and Aluminum Foundry Inc.,MBAF)占地面积35000平方英尺(3252m^2),该铸造厂自1927年以来一直是黄铜、青铜和铝合金砂型铸件的供应商,客户涉及食品加工、玻璃成形、高压电器等多个行业。随着硅砂采购、运输、搬运和处置成本的增加,该厂寻求降低成本的方法。
