The effects of erbium addition on the rheological properties and microstructure of a semisolid A356 alloy were studied.The semisolid slurries were prepared through the serpentine channel technique before they were thixoformed using parallel-plate compression with cylindrical discs.The grain and globule size decreases as the Er content increases,resulting in an improved and uniform distribution of spherical primary α-Al phase within the semisolid slurry.The addition of the Er modifies the grain morphology and size of the α-Al grains,resulting in a better and more uniform distribution of spherical primary α-Al phase within the semisolid slurry.As a result,rheocast quality index increases with the addition of Er,which is suitable for the thixoforming process.The A356 alloy without Er has the highest viscosity herein.The viscosity decreases,and the flow characteristics of the semisolid feedstock are expected to improve when Er is added as a result of the refinement of primary α-Al and modification of eutectic silicon.Furthermore,the refined semisolid A356 alloys with Er show a slightly larger fraction of high-angle grain boundaries compared to that for the unrefined alloy.

Chaiyawat Peeratatsuwan;Phromphong Pandee;Ussadawut Patakham;Chaowalit Limmaneevichitr

Department of Production Engineering,Faculty of Engineering,King Mongkut's University of Technology Thonburi,Bangmod,Tungkhru,Bangkok,10140,Thailand;Center for Lightweight Materials,Design and Manufacturing,King Mongkut's University of Technology Thonburi,Bangmod,Tungkhru,Bangkok,10140,Thailand;National Metal and Material Technology Center,National Sciences and Technology Development Agency,Thailand Science Park,Klong Luang,Pathumthani,12120,Thailand

稀土学报（英文版）

[1]Chaiyawat Peeratatsuwan;Phromphong Pandee;Ussadawut Patakham;Chaowalit Limmaneevichitr-.Microstructure and rheological properties of a semisolid A356 alloy with erbium addition)[J].稀土学报（英文版）,2022(07):1148-1155

thixoformed,rheocast,thixoforming

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