Precipitation behavior of Al-Si-Cu-Mg (-Fe) alloys by a deformation-semisolid extrusion process
Abstract Al-4.5 Si-1Cu-0.3 Mg (-1Fe)(wt%) alloys fabricated by a deformation-semisolid
extrusion (D-SSE) process have been investigated by transmission electron microscopy,
down to the atomic level. T5 and T6 heat treatments were conducted to understand the age-
hardening behavior of the alloys. Disordered Mg-Si (-Cu) precipitates with strong Cu
enrichments at their interfaces with the Al matrix have been observed in the overaged
conditions of both heat treatments and in the peak hardness of the T6 condition, but only Cu …
extrusion (D-SSE) process have been investigated by transmission electron microscopy,
down to the atomic level. T5 and T6 heat treatments were conducted to understand the age-
hardening behavior of the alloys. Disordered Mg-Si (-Cu) precipitates with strong Cu
enrichments at their interfaces with the Al matrix have been observed in the overaged
conditions of both heat treatments and in the peak hardness of the T6 condition, but only Cu …
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