Effect of current Mg concentration on interfacial reactions during remelting of Al-Mg(5083)/Al{sub 2}O{sub 3p} composites

Journal Article · Sun Sep 15 04:00:00 EDT 2002 · Materials Characterization

DOI:https://doi.org/10.1016/S1044-5803(02)00359-5· OSTI ID:20748670

Zhong, W M; L'Esperance, G; Suery, M

The interfacial reactions between Al{sub 2}O{sub 3} particles and 5083 Al-Mg alloys during fabrication by compocasting and subsequent remelting at 800 deg. C for 0.5 and 4 h have been studied using analytical transmission electron microscopy (TEM) and scanning electron microscopy (SEM). It is found that the reaction product is changed with increasing remelting time. MgO is the main reaction product after casting and remelting for 0.5 h. The MgO crystals are then very small (about 5-20 nm in size) and the reaction zone is about 50-80 nm thick for the as-cast material and about 100-150 nm after remelting for 0.5 h. However, after remelting for 4 h, MgO is transformed into MgAl{sub 2}O{sub 4} and the interfacial region is then constituted of large MgAl{sub 2}O{sub 4} crystals of about 1 {mu}m in size. This transformation indicates that the nature of the reaction products is controlled by the current Mg content in the matrix.

• OSTI ID: 20748670
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 2 Vol. 49; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ALUMINIUM OXIDES
CASTING
CASTINGS
CRYSTALS
MAGNESIUM OXIDES
METALS
PARTICLES
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
ZONES