Fracture modes in MoSi sub 2

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb04246.x· OSTI ID:7306663

Wade, R K ^[1]; Petrovic, J J ^[2]

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1. Arizona Materials Lab., Dept. of Materials Science and Engineering, Univ. of Arizona, Tuscon, AZ (US)
2. Ceramic Science and Technology Group, Materials Science and Technology Div., Los Alamos National Lab., Los Alamos, NM (US)

This paper reports on the room-temperature fracture behavior of polycrystalline MoSi{sub 2} that was characterized using Vickers indentation fracture. Fracture analysis was aided by the optically active grain structure of MoSi{sub 2} revealed under polarized light. Radial crack propagation from indentations was found to be predominantly transgranular. The approximate indentation fracture toughness of MoSi{sub 2} was 3 MPa {center dot} m{sup 1/2}, while the measured hardness was 8.7 GPa. Fracture behavior is believed to be controlled by anisotropy and cleavage energy of the tetragonal MoSi{sub 2} crystal structure.

• OSTI ID: 7306663
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:6; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ANISOTROPY
BEAMS
CRACK PROPAGATION
CRYSTAL STRUCTURE
CRYSTALS
FRACTURE MECHANICS
GRAIN BOUNDARIES
MECHANICS
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
POLARIZED BEAMS
POLYCRYSTALS
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VICKERS HARDNESS