Microstructures and Mechanical Properties of Semi-solid Modified 6061 Aluminum Alloy Samples by Rheo-diecasting
The rheological high pressure die casting process(Rheo-HPDC)samples of semi-solid modified 6061 alu-minum alloy were prepared by graphite serpentine channel pouring process(SCP)and Rheo-HPDC.The microstruc-ture of 6061 aluminum alloy formed by traditional die casting and rheo-diecasting was analyzed comparatively.The effects of Si content on the microstructure and mechanical properties of Rheo-HPDC samples of semi-solid modified 6061 aluminum alloys were investigated.The results indicate that compared with the traditional die casting,the micro-structure of primary α-Al grains in the Rheo-HPDC samples of semi-solid modified 6061 aluminum alloys are signifi-cantly improved and refined,which is evolved from coarse dendrites to fine spherical or subspherical crystals.The pri-mary α-Al grains can be effectively refined and the mechanical properties can be improved with increasing in the Si con-tent.When Si content is increased from 0.6%to 2.6%,the average grain diameter of primary α-Al grains is decreased approximately from 58 μm to 31 μm,the tensile strength is increased from(107±4)MPa to(209±14)MPa,and elongation is increased from 2.2%±0.3%to 5.5%±0.5%.
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