Vol.6 No.6 (November 2016)
Influence of Solution Treatment Process Parameters on Semi-Solid 7075 Al Alloy Slurry
The semi-solid slurry of 7075 aluminum alloy was prepared by inverted cone-shaped pouring channel process, and the influence of process parameters on the microstructure evolution of 7075 aluminum alloy slurry during solution treatment was investigated. The results shows that when the solution temperature was between 460˚C - 475˚C, and the solution time was between 1 h - 6 h, as the solution temperature and solution time increased, the dissolution of secondary phase particles in the matrix of slurry was significantly enhanced, and the size of the primary α-Al was still small with a slightly reduce of shape factor. When the solution temperature was above 490˚C, the size of the primary α-Al was significantly enhanced and the grain remelting appeared. The increase in grain growth rate was ascribed to the dissolution of secondary phase particles, whose inhibiting effect on grain boundary migration decreased. When the solution temperature was 475˚C, as the solution time increased, the dissolution of secondary phase particles was more obvious.
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