Basic property in semi-solid forging of aluminum alloy A7075

Abstract

This paper describes the basic characteristics of semi-solid forging of aluminum alloy A7075. Semi-solid forging has some advantages, such as better dimensional accuracy than casting and smaller molding load than cold forging. And semi-solid materials can be expected to have improved mechanical properties compared with ordinary materials. Forging was carried out simulating semi-solidified die casting of A7075, which is difficult to process compared with other wrought materials, and the influence of manufacturing conditions on porosity, impurities, surface texture and microstructure was investigated. Using a servo press (by AMADA Co.,Ltd.) and a die cushion, a test piece without cracks was produced by applying a load of 40 tons to a semi-solidified slurry at 525 ° C for 10 seconds. When the test piece was visually confirmed, the impurity was 0.02 pieces /mm² , and porosity cavity was 0.0086 pieces /mm² . Spherical equiaxed primary alpha aluminum was observed in the punch side, the center side and the die side.