Mechanical characterization of SiC whisker-reinforced MoSi/sub 2/

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6889962

Carter, D H; Gibbs, W S; Petrovic, J J

The mechanical characteristics of an intermetallic matrix with two different reinforcements were studied. The matrix material was MoSi/sub 2/, with either Los Alamos VLS SiC whiskers or Huber VS SiC whiskers. The purpose of the reinforcement was to provide toughening at ambient temperature and strengthening at elevated temperatures. The VLS whiskers greatly improved the yield strength of the matrix at 1200/degree/C, and also increased the room temperature fracture toughness of the matrix. The VS whiskers were added because they are much smaller in length and diameter, and therefore decreased the mean free path between whiskers, at the same volume fraction. The VS whiskers improved the toughness of the matrix at ambient temperature, and increased the yield strength of MoSi/sub 2/ at 1400/degree/C by 470%. The high strength of this new composite places this material in the realm of attractive engineering materials for high-temperature applications. 11 refs., 6 refs., 1 tab.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6889962
• Report Number(s): LA-UR-88-3776; CONF-881125-3; ON: DE89003486
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CARBIDES
CARBON COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
CRYSTALS
FABRICATION
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HOT PRESSING
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
MONOCRYSTALS
PRESSING
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON CARBIDES
SILICON COMPOUNDS
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS
WHISKERS
YIELD STRENGTH