An orthogonal test was conducted to investigate the influence of technical parameters of squeeze casting on the strength and ductility of AISigCu3 alloys. The experimental results showed that when the forming pressure...An orthogonal test was conducted to investigate the influence of technical parameters of squeeze casting on the strength and ductility of AISigCu3 alloys. The experimental results showed that when the forming pressure was higher than 65 MPa, the strength （ab） of A1Si9Cu3 alloys decreased with the forming pressure and pouring temperature increasing, whereas ab increased with the increase of filling velocity and mould preheating temperature. The ductility （6） by alloy was improved by increasing the forming pressure and filling velocity, but decreased with pouring temperature increasing. When the mould preheating temperature increased, the ductility increased first, and then decreased. Under the optimized parameters of pouring temperature 730 ℃, forming pressure 75 MPa, filling velocity 0.50 m/s, and mould preheating temperature 220 ℃, the tensile strength, elongation, and hardness of A1Si9Cu3 alloys obtained in squeeze casting were improved by 16.7%, 9.1%, and 10.1%, respectively, as compared with those of sand castings.展开更多
The experimental and analytical approaches were taken to investigate the non-dendritic microstructure formation and evolution of AlSi9Cu3 alloy during rheocasting.The results show that the globular primary α(Al) part...The experimental and analytical approaches were taken to investigate the non-dendritic microstructure formation and evolution of AlSi9Cu3 alloy during rheocasting.The results show that the globular primary α(Al) particles free of entrapped eutectic form after rheocasting for 3 s,and could be morphologically stabilized during subsequent growth.The fine and globular particles underwent a coarsening process under quiescently continuous cooling in which the particle density decreases,the solid fraction increases,the average particle size increases with the increase of solidification time at a rate that closely followed the classical Ostwald ripening.展开更多
基金Project(11C26211304055) supported by Small to Medium Enterprise Innovation Fund
文摘An orthogonal test was conducted to investigate the influence of technical parameters of squeeze casting on the strength and ductility of AISigCu3 alloys. The experimental results showed that when the forming pressure was higher than 65 MPa, the strength （ab） of A1Si9Cu3 alloys decreased with the forming pressure and pouring temperature increasing, whereas ab increased with the increase of filling velocity and mould preheating temperature. The ductility （6） by alloy was improved by increasing the forming pressure and filling velocity, but decreased with pouring temperature increasing. When the mould preheating temperature increased, the ductility increased first, and then decreased. Under the optimized parameters of pouring temperature 730 ℃, forming pressure 75 MPa, filling velocity 0.50 m/s, and mould preheating temperature 220 ℃, the tensile strength, elongation, and hardness of A1Si9Cu3 alloys obtained in squeeze casting were improved by 16.7%, 9.1%, and 10.1%, respectively, as compared with those of sand castings.
基金Project(50804023) supported by National Natural Science Foundation of ChinaProject(205084) supported by Ministry of Education Focused on Scientific and Technological Research
文摘The experimental and analytical approaches were taken to investigate the non-dendritic microstructure formation and evolution of AlSi9Cu3 alloy during rheocasting.The results show that the globular primary α(Al) particles free of entrapped eutectic form after rheocasting for 3 s,and could be morphologically stabilized during subsequent growth.The fine and globular particles underwent a coarsening process under quiescently continuous cooling in which the particle density decreases,the solid fraction increases,the average particle size increases with the increase of solidification time at a rate that closely followed the classical Ostwald ripening.
