Accession Number : AD0745002

Title :   Development of Laminate Metal Matrix Composites.

Descriptive Note : Final rept. 16 Apr 71-15 Apr 72,

Corporate Author : NATIONAL RESEARCH CORP CAMBRIDGE MASS

Personal Author(s) : Hordon,M. J.

Report Date : MAY 1972

Pagination or Media Count : 49

Abstract : Boron carbide-reinforced titanium laminate composites were fabircated containing up to 50 percent B4C volume fraction with interlaminar spacings in the range 7 - 25 micrometers. Mechanical properties increased with B4C content. At the 50 percent B4C level, the biaxial tensile elastic modulus was 245 GN/sq, and the biaxial fracture strength was approximately 665 MN/sq at 20C and about 300 MN/sq at 650C. Fracture energy values derived from Charpy impact tests were 40.7 KJ/sq for loads applied transverse to the laminar plane and 25.4 KJ/sq for loads applied parallel to the laminar plane. The B4C-Ti laminates resisted extended cyclic thermal exposures to 650C with minimal residual strength loss or distortion. (Author)

Descriptors :   (*COMPOSITE MATERIALS, *LAMINATES), TITANIUM, BORON COMPOUNDS, CARBIDES, MICROSTRUCTURE, MECHANICAL PROPERTIES

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE