Subsequent Deformation And Heat Treatment Of Twin-roll Casting 6181 Aluminum Alloy

6xxx aluminum alloy become the ideal choice for lightweight automotive materials for its high strength,good formability,well heat dissipation,corrosion resistance,and so onIn this paper 6181 aluminum alloy slabs were cast by twin-roll casting and then cold rolled to the final products.The effects of solid solution and aging treatment on the microstructure and properties of aluminum alloy were studied.The heat treatment process of 6181 aluminum alloy was determined according to baking hardening.This paper has obtained the following results:(1)In the 6181 aluminum alloy,the AlSi phase was existed except for the ?-Al and Mg2Si phases.After the solution treatment at 540?/30min,the AlSi phase is basically integrated into the matrix,while the Mg2Si phase has a amount of residual.(2)With the increase of the pre-aging temperature,the time for precipitation of the AlSi phase was shortened.The precipitation of AlSi phase in the alloy reaches the maximum when the pre-aging is 190?/10min.(3)During the artificial aging,the AlSi phase began to precipitate after 48h and reached the maximum at 96h.(4)It was found that the amount of phase precipitated in the alloy did not change significantly after the pre-aging sheet was baked at 180?/30min.(5)With the pre-aging and baking treatment process,when the pre-aging system is 150?/3min,the tensile strength of the alloy reaches a maximum of 312.7MPa.When the pre-aging system is 190?/7min,the yield strength of the alloy reaches the maximum value of 305.6MPa.When the artificial aging is 180?/4h,the tensile strength and yield strength of the alloy reach the maximum value of 374.7MPa and 370.2MPa...