Characterizations of shock-loaded aluminum-infiltrated boron carbide cermets
Shock-recovery experiments were performed on aluminum-infiltrated B/sub 4/C cermets as a function of shock pressure and composition. The effect of strain rate under uniaxial stress loading was also studied. Compressive strength was determined to be insensitive to strain rate between 10/sup /minus/3/ and 10/sup 3/ s/sup /minus/1/. TEM examination revealed dislocation debris and twins in a few B/sub 4/C grains aftershock-loading above an upper bound HEL estimate. Below this shock pressure the B/sub 4/C substructure responded elastically. Elastic moduli and strengths were highly dependent on the fraction of B/sub 4/C in the cermets. However, high yield and failure strains and limited fragmentation after shock loading attest that the aluminum phase contributes significantly to the strength and integrity. 4 refs., 3 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5676816
- Report Number(s):
- LA-UR-89-2691; CONF-890812-31; ON: DE89016773
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM
BORON CARBIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CERMETS
COMPOSITE MATERIALS
COMPRESSION STRENGTH
CRYSTAL STRUCTURE
ELASTICITY
ELEMENTS
FAILURES
FRACTURES
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
SHOCK WAVES
STRAIN RATE
TENSILE PROPERTIES