Accession Number:

ADA229143

Title:

Tailored Interfaces for Metal-Matrix Composites-Fundamental Considerations

Descriptive Note:

Annual rept. 1 Oct 1989-30 Sep 1990,

Corporate Author:

NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

1990-10-31

Pagination or Media Count:

61.0

Abstract:

The objective of this research is to determine the interface properties needed for successful metal matrix composites and to learn how to achieve these properties. A number of factors have been selected for the study. These are thermodynamic stability of the interface, nature of the bonding across the interface, energy and structure of the interface, and role of adsorption at the interface. A number of systems have been chosen to probe these factors namely, AlTiC, Alalpha-Al2O3, A1MgAl2O4spinel, AlAl3Tix, Zr1-x, MgSiC, MgMgO, and MgAl2O3. Techniques for preparing all of these composites have been worked out, including mechanical alloying followed by extrusion, arc melting, and liquid metal infiltration. MMCs also were obtained from Martin Marietta and Dow. Microstructures of the resulting MMCs are presented and discussed along with preliminary studies of some of the interfaces using transmission electron microscopy. In comparison to AlSiC, AlTiC and MgSiC show no evidence of chemical reaction at the interface during processing. AlMgAl2O4spinel has superior mechanical properties to Alalpha-AlO3, both prepared identically. Author tr

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE