Abstract
The SEED rheocasting process was used to produce semisolid slurries of high strength 7075 aluminum wrought alloys. The effects of the SEED processing parameters on the microstructure of semisolid slurries were studied. The impact of grain refinement on the grain morphology and size was investigated. The rheological properties of semisolid 7075 alloys were characterized at different solid fractions using a parallel plate compression viscometer. Results indicated that the grain refinement could greatly improve the globularity of α-Al grains and rheoformability. The relationships between viscosity and shear rate at different solid fractions in the transient state for both unrefined and refined semisolid slurries were evaluated and discussed.
Highlights
There is a strong demand to semisolid forming of high strength 7075 aluminum components, which are currently manufactured by costly machining process
Further increase in the frequency to 210 RPM has a limited effect on the grain morphology and size
It is worth mentioning that the homogenous globular grains is hardly achieved by only altering the SEED parameters for the 7075 alloy, and further modification of the microstructure is required
Summary
There is a strong demand to semisolid forming of high strength 7075 aluminum components, which are currently manufactured by costly machining process. For semisolid forming of 7075 alloys, thixoforming has been majorly used that involves reheating of extruded billet into the semisolid state followed by die casting process [1,2,3]. Rheocasting is a reliable semisolid processing that the semisolid slurry is produced directly from liquid phase [4,5]. The liquid metal is stirred while it is simultaneously cooled down to obtain the desired processing temperature corresponding to a predetermined solid faction. The SEED process is one of few commercially available rheocasting technologies to produce high quality semisolid aluminum slurries in the foundry industry [7]
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