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Inelastic deformation of metal matrix composites: Plasticity and damage mechanisms, part 2. Final Report

Technical Report ·
OSTI ID:6857332
;
The inelastic deformation mechanisms for the SiC (SCS-6)/Ti-15-3 system were studied at 538 C (1000 F) using a combination of mechanical measurements and detailed microstructural examinations. The objectives were to evaluate the contributions of plasticity and damage to the overall MMC response, and to compare the room temperature and elevated temperature deformation behaviors. Four different laminates were studied: (0)8, (90)8,(+ or -45)2s, and (0/90)2s, with the primary emphasis on the unidirectional (0)8, and (90)8 systems. The elevated temperature responses were similar to those at room temperature, involving a two-stage elastic-plastic type of response for the (0)8 system, and a characteristic three-stage deformation response for the (90)8 and (+ or -45)2s systems. The primary effects of elevated temperatures included: (1) reduction in the 'yield' and failure strengths; (2) plasticity through diffused slip rather than concentrated planar slip (which occurred at room temperature); and (3) time-dependent deformation. The inelastic deformation mechanism for the (0)8 MMC was dominated by plasticity at both temperatures. For the (90)8 and (+ or -45)2s MMCs, a combination of damage and plasticity contributed to the deformation at both temperatures.
Research Organization:
Battelle Columbus Labs., OH (United States)
OSTI ID:
6857332
Report Number(s):
N-93-15401; NASA-CR--189096-PT-2; E--7412-PT-2; NAS--1.26:189096-PT-2; CNN: RTOP 510-01-50
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DAMAGE
DEFORMATION
DIFFUSION
ELEMENTS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
PLASTICITY
REDUCTION
SILICON CARBIDES
SILICON COMPOUNDS
SLIP
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TENSILE PROPERTIES
TIME DEPENDENCE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YIELD STRENGTH