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:

1972-05-01

Pagination or Media Count:

49.0

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 GNsq, and the biaxial fracture strength was approximately 665 MNsq at 20C and about 300 MNsq at 650C. Fracture energy values derived from Charpy impact tests were 40.7 KJsq for loads applied transverse to the laminar plane and 25.4 KJsq 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