Rapid solidification of Al-Cu droplets of near eutectic composition

Joint 5th International Conference on Advances in Solidification Processes;5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining

土木建筑工程;计算机科学

Bogno, A.-A.^1 ; Valloton, J.^1 ; Jimenez, D.D.^1 ; Rappaz, M.^2 ; Henein, H.^1

Department of Chemical and Materials Engineering, University of Alberta, Edmonton

AB

T6G 2G6, Canada^1

Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, Lausanne

CH-1015, Switzerland^2

关键词: Droplet diameters;    Eutectic morphology;    Lamellar eutectic;    Microhardness measurement;    Near-eutectic composition;    Rapidly solidified;    Scanning electronic microscopy;    Structural morphology;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/529/1/012021/pdf
DOI  :  10.1088/1757-899X/529/1/012021

来源: IOP

【 摘 要 】

Near eutectic Al-Cu droplets were rapidly solidified by Impulse Atomization. A wide range of microstructural scales was obtained at different cooling rates and undercoolings. The micrographs of the investigated samples revealed two distinct zones of different structural morphologies: An undulated eutectic morphology developed during recalescence following the single grain nucleation and a regular lamellar eutectic morphology resulting from the solidification of the remaining liquid post recalescence. The volume fraction of each zone was measured as a function of the droplet diameter, and the nucleation undercooling was deduced using the hypercooling limit equation. Scanning Electronic Microscopy imaging and microhardness measurements were used to evaluate the microstructural scale, and mechanical properties.