Microstructure and rheological properties of a semisolid A356 alloy with erbium addition  

作　　者：Chaiyawat Peeratatsuwan Phromphong Pandee Ussadawut Patakham Chaowalit Limmaneevichitr 

机构地区：[1]Department of Production Engineering,Faculty of Engineering,King Mongkut's University of Technology Thonburi,Bangmod,Tungkhru,Bangkok,10140,Thailand [2]Center for Lightweight Materials,Design and Manufacturing,King Mongkut's University of Technology Thonburi,Bangmod,Tungkhru,Bangkok,10140,Thailand [3]National Metal and Material Technology Center,National Sciences and Technology Development Agency,Thailand Science Park,Klong Luang,Pathumthani,12120,Thailand

出　　处：《Journal of Rare Earths》2022年第7期1148-1155,共8页稀土学报（英文版）

摘　　要：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 compre ssion with cylindrical discs.The grain and globule size decreases as the Er content increases,resulting in an improved and uniform distribution of spherical primaryα-Al phase within the semisolid slurry.The addition of the Er modifies the grain morphology and size of theα-Al grains,resulting in a better and more uniform distribution of spherical primaryα-AI 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 a-Al and modification of eutectic silicon.Furthermore,the refined semisolid A356 alloys with Er show a slightly larger fraction of highangle grain boundaries compared to that for the unrefined alloy.

关 键 词：ERBIUM THIXOFORMING Serpentine channel Hypoeutectic Al-Si alloy Parallel-plate compression Rare earths 

分 类 号：TG146.21[一般工业技术—材料科学与工程]