ZrO sub 2 reinforced-MoSi sub 2 matrix composites

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5808009

Petrovic, J J; Honnell, R E; Mitchell, T E ^[1]; Wade, R K ^[2]; McClellan, K J ^[3]

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1. Los Alamos National Lab., NM (USA)
2. Arizona Materials Lab., Tucson, AZ (USA)
3. Case Western Reserve Univ., Cleveland, OH (USA). Dept. of Materials Science and Engineering

ZrO{sub 2} particle-MoSi{sub 2} matrix composites were fabricated by wet processing/hot pressing, using high quality unstabilized, partially stabilized, and fully stabilized ZrO{sub 2} powders. Composite room temperature indentation fracture toughness increased with increasing volume fraction of ZrO{sub 2} reinforcement. Unstabilized ZrO{sub 2} produced the highest composite fracture toughness, 7.8 MPa m{sup {1/2}} as compared to 2.6 MPa m{sup {1/2}} for pure MoSi{sub 2}. Unstabilized ZrO{sub 2} composites exhibited matrix microcracking, and the spontaneous tetragonal-to-monoclinic ZrO{sub 2} phase transformation induced significant plastic deformation in the MoSi{sub 2} matrix. Partially stabilized ZrO{sub 2} produced a lesser extent of composite fracture toughening, possibly as a result of an inhomogeneous ZrO{sub 2} particle distribution and presence of a glassy phase. 13 refs., 6 figs., 1 tab.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5808009
• Report Number(s): LA-UR-91-1642; CONF-910162--7; ON: DE91013074
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360603* -- Materials-- Properties
CHALCOGENIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
FABRICATION
FRACTURE PROPERTIES
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES