Abstract
A semisolid slurry of 7075 aluminum alloy was prepared by means of a serpentine channel process (SCP) and rheo-diecasting. The influences of pouring temperature during slurry preparation, the injection pressure and die preheat temperature on the mechanical properties and microstructure of a rheo-diecast 7075 aluminum alloy were investigated. The results show that the as-cast strength and elongation of the tensile samples were 210–260 MPa and 0.2%–1.7%, respectively, with an injection pressure of 130 MPa, a pouring temperature of 700–720 °C, a preheat temperature of 280–350 °C, and a plunger speed of 0.5 ms−1. The results also show that the aged strength and elongation of the tensile samples were 420–453 MPa and 1.0%–1.4%, respectively, when the alloy solution was treated at 470 °C for 12 h and aged at 120 °C for 24 h. The substantial shrinkage porosity in the 7075 aluminum alloy tensile samples was the main cause of low elongation.
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