Effect of Gas Induced Semi-Solid process (GISS) on microstructure of A380 aluminum alloy

Gas Induced Semi-Solid (GISS) process was developed to create semi-solid slurry with fine and uniform globular structure. This paper presents the effect of GISS process on microstructure of A380 aluminium alloy. The combination of local rapid heat extraction and vigorous agitation by the injection of fine inert gas bubbles through a graphite diffuser in molten metal held at a temperature above its liquidus temperature changes the morphology ofprimary α-Al from coarse dendritic to rosette-like and finally to fine globular. Optical microscopy studies revealed that after conducting GISS process under optimum condition, dendritic morphology of primary α-Al phase changed to spherical shape and the sphericity of 0.88, particle size of 54.23 μm and number of 177 α-Al particle per mm2 were achieved.

کلیدواژه ها:

GISS process ، gas induced semi-solid ، spherical α-Al phase ، A380 aluminium alloy