Development of Laminate Metal Matrix Composites

摘要

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)