Structure of molten Al–Si alloys

• Published in: Journal of non-crystalline solids Vol. 353; no. 32-40; pp. 3005 - 3010
• Main Authors: Dahlborg, U., Besser, M., Calvo-Dahlborg, M., Cuello, G., Dewhurst, C.D., Kramer, M.J., Morris, J.R., Sordelet, D.J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.10.2007; Elsevier
• Subjects: ALLOYS; Chemical Sciences; Condensed Matter; Condensed matter: structure, mechanical and thermal properties; Cristallography; Disordered Systems and Neural Networks; EUTECTICS; Exact sciences and technology; Liquid alloys and liquid metals; Liquid metals and alloys; Material chemistry; Materials Science; Medium-range order; MICROSTRUCTURE; NEUTRON DIFFRACTION; Neutron diffraction/scattering; NEUTRONS; Physics; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; SCATTERING; SHAPE; Short-range order; Structure; STRUCTURE FACTORS; Structure of solids and liquids; crystallography; Studies of specific liquid structures; Liquid alloys and liquid metals; Short-range order; Neutron diffraction/scattering; Microstructure; Structure; Medium-range order; Cooling; Structure factors; Medium range order; Heat treatments; Neutron diffusion; Silicon alloys; Liquid alloys; Aluminium alloys; Small angle neutron scattering; Eutectic alloys; Chemical composition; Liquid structure; Melts
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2007.05.031

The temperature variation of the structure and microstructure of molten eutectic Al1−xSix alloys (x=0.122 and 0.20) have been studied by neutron diffraction and small-angle neutron scattering (SANS), as well as measurements performed on pure liquid Al. All measurements have been performed at five temperatures in a heating–cooling loop. The SANS results unambiguously show that for the eutectic alloy (x=0.122) the microstructure changes with increasing temperature in a partly reversible way while for the hypereutectic (x=0.20) alloy the change is almost completely irreversible. This change in microstructure also manifests itself in the shape of the static structure factor S(Q).