Pressure treatment of aluminum–magnesium alloys solidified under high centrifugal forces

The process of centrifugal casting of AMg5 and AMg6 alloys was tested under gravitational load coefficients (GLC) of 300g and 500g. It was found that the positive effect of increased GLC on melt crystallization is more pronounced when casting alloys with higher alloying element content. This promotes not only grain refinement and melt purification from brittle iron‑silicon compounds but also enhances the solubility of alloying elements in α(Al). Thus, castings from AMg6 obtained at 500g, compared to those at 300g, showed 1.1 and 1.3 times higher strength and ductility, respectively. Compared to the best samples of cast AMg6 alloy produced according to GOST 1583–93, centrifugal casting at 500g yielded an AMg6 alloy with strength, ductility, and hard‑ ness increased by 15–25, 10–50, and 40 %, respectively. Moreover, the alloy exhibits a structure equivalent to that obtained through solution heat treatment. Using the rolling method, the process of plastic deformation of AMg5 and AMg6 aluminum‑ magnesium alloys with structures obtained via casting at 500g was studied. As a result of developing various rolling routes, the AMg6 cast alloy obtained at 500g was strengthened, achieving a 1.6‑fold increase in strength and hardness at a total deformation of 60 %. The resulting AMg6 material had a strength ranging from 411 to 435 MPa and an elongation of 10 to 13 %, de‑ pending on the tensile direction. The results demonstrate the promise and necessity of further research into producing AMg alloys via centrifugal casting under GLCs of 300–500g followed by plastic deformation.

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