An overview of the effects of bifilms on the structure and properties of cast alloys
Abstract
A short overview of the role of bifilms (double oxide films) in cast Al alloys includes control of (1) grain size, because of the suppression of convection; (2) dendrite-arm spacing (DAS) as a result of isolated regions of liquid devoid of nuclei that consequently undercool; and (3) the mechanism of the modification of Al-Si alloys by Na and Sr, which is explained for the first time by the deactivation of bifilms as substrates for Si nucleation and growth.
- Publication:
-
Metallurgical and Materials Transactions B
- Pub Date:
- December 2006
- DOI:
- 10.1007/BF02735006
- Bibcode:
- 2006MMTB...37..857C