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The formation of rosette α phase, structural evolution during the reheating and semi-solid casting of AlSi7Mg alloy

2003; Elsevier BV; Volume: 137; Issue: 1-3 Linguagem: Inglês

10.1016/s0924-0136(02)01075-0

1873-4774

Yongzhong Zhang, Kui Zhang, Guojun Liu, Jun Xu, Shi Li-kai, Daijin Cui, Xuping Wu, Bo Cui,

Metallurgy and Material Forming

Abstract The non-dendritic primary phase is required for the production of parts through the semi-solid metal forming process, for which the spherical phase is the most favored. Under the condition of continuous casting with electromagnetic stirring, the primary phase tends to be rosette-like. For AlSi7Mg alloy, there are three possible aspects contributing to the formation of the rosette α phase. The billets can be reheated to their semi-solid state reliably and repeatedly through a two-phase heating procedure using a vertical tube furnace. The workable temperature is around 577–580 °C. For demonstration, the connecting rods for an air compressor were fabricated successfully through the semi-solid forming process using a 350 t high-pressure die casting unit.