The mechanisms for spontaneous grain refinement in undercooled Cu-O and Cu-Sn melts

Authors
Cochrane, RF Battersby, SE Mullis, AM
Citation
Rf. Cochrane et al., The mechanisms for spontaneous grain refinement in undercooled Cu-O and Cu-Sn melts, MAT SCI E A, 304, 2001, pp. 262-266
Citations number
15
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
304
Year of publication
2001
Pages
262 - 266
Database
ISI
SICI code
0921-5093(20010531)304:<262:TMFSGR>2.0.ZU;2-X
Abstract
A melt encasement (fluxing) technique has been used to systematically study the velocity-undercooling relationship and microstructural development in samples of Cu-O and Cu-3 wt.% Sn at undercoolings up to 250 K. Both systems experience spontaneous grain refinement at high undercooling, but there ar e sufficient microstructural differences to suggest the mechanisms operatin g are different. In Cu-Sn grain refinement appears to be a consequence of r ecrystallisation, whereas in Cu-O a dendrite fragmentation process may have occurred. (C) 2001 Elsevier Science B.V. All rights reserved.