ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
A coupled cellular automaton-finite difference (CA-FD) model is used to simulate thedetailed dendritic structure evolution of the columnar-to-equiaxed transition (CET) for Al-Cu alloysduring solidification. The effects of material properties (nucleation undercooling, density of nuclei inbulk liquid and alloy solidification range) on the CET are investigated. Simulated results reveal that:(1) equiaxed grains form at an earlier stage with a smaller critical nucleation undercooling; (2) CET ispromoted if the density of nuclei in bulk liquid is increased; (3) extending the alloy solidificationrange promotes the CET. Finally, CET maps corresponding to different alloy concentrations areconstructed, illustrating the relationship between processing conditions and the resulting grainstructures for alloys with different solidification ranges
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.139.129.pdf