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Semi-solid forging of a high strength Al alloy was carried out to investigate the macro-segregation characteristics in regard to the evolution of solidification microstructures. The evolution of segregation was closely affected by the feeding behavior of semi-solid slurries. Two types of macro-segregation were found in semi-solid forging: one is composed of fine dendritic ¡-Al particles caused by liquid segregation and the other is the residual eutectic segregation. The formation of these segregations was strongly affected by the quality of semi-solid slurries, such as the shape and the size of the primary ¡-Al particles. In the case of coarse dendritic microstructures, ¡-Al particles are easily interlocked with each other, resulting in the formation of macro-segregation. In the case of fine and uniform globular microstructures, primary globular ¡-Al particles can be readily filled into a die cavity during forging, leading to uniform microstructures without the formation of macro-segregation. Optimization of process parameters was carried out both for semi-solid slurry making and for semi-solid forging. The T6 heat treatment was carried out, and hardness distribution on the semi-solid forging specimens was also evaluated to investigate the effect of macro-segregation on mechanical properties. [doi:10.2320/matertrans.M2014201]

Macro-Segregation Characteristics in Semi-Solid Forging of a High Strength Al-4.8Si-0.7Mg Alloy