Accession Number : AD0754570

Title :   Some Atomistic Observations on the Role of Titanium in Magnesium-Graphite Fiber Composites.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s) : Richman,Marc H. ; Levitt,Albert P. ; DiCesare,Eugene

Report Date : OCT 1972

Pagination or Media Count : 18

Abstract : ITANIUM CARBIDE, TITANIUM OXIDE, *FIBER COMPOSITESTitanium, when used as a fiber coating, has been found to effectively promote wetting and bonding between graphite fibers and magnesium, thereby permitting the fabrication of magnesium-graphite fiber composites having significantly improved strength and stiffness. This report presents an atomistic analysis of the role of titanium in this composite system. To this end, the fiber-matrix interfacial compounds that could be formed when molten magnesium is brought into contact with Ti-coated graphite fibers are deduced from atomistic, thermodynamic, and crystallographic data. Comparison of theory and experiment indicates that the sound bonding attained in this system could result from any of the possible atomistic hypotheses proposed. This analysis provides a basis for understanding the mechanisms by which excellent fiber-matrix wetting and bonding have been achieved by the use of a titanium intermediate layer in the fabrication of this composite system. (Author)

Descriptors :   (*COMPOSITE MATERIALS, *CARBON FIBERS), (*COATINGS, TITANIUM COMPOUNDS), MAGNESIUM, INTERFACES, OXIDES, CARBIDES, SURFACE ACTIVE SUBSTANCES, BONDING, REINFORCING MATERIALS

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE