Tensile strength and fracture toughness of particulate SiC-2124 aluminum composites
- Indian Inst. of Technology, Kanpur (India). Dept. of Materials and Metallurgical Engineering
The 2124 Al-SiC composites having 10 and 20 vol.% of SiC particulates with sizes of 0.25 {mu}m and 17 {mu}m were processed by the P/M route followed by hot extrusion. Their tensile properties and fracture toughness were assessed in the peak-aged (T6) condition by standard and notch tensile tests. All the composites exhibit higher yield strength and lower ductility than the unreinforced alloy. The finer reinforcements (0.25 {mu}m) are more effective in this regard than the coarser ones (17 {mu}m). The maximum increase in yield strength is {approximately}40% over the matrix alloy in the composite with 0.25 {mu}m and 20 vol.% SiCp. While the tensile strength of composites with fine SiCp is higher than that of the unreinforced alloy, marginally lower tensile strength is observed in those with coarse SiCp. The effect of volume fraction on tensile properties is however minor in both the composites with fine and coarse SiCp. The observed increase in yield strength of composites relative to the unreinforced matrix is assessed in terms of direct load sharing by reinforcements and the indirect effects of particles in modifying the matrix grain size and dislocation density. The notch tensile strength, notch yield strength ratio and fracture toughness evaluated from notch tensile tests are lower than those of the unreinforced alloy. The critical stress intensity factor (K{sub Q}) for fracture of composites evaluated by the notch tensile test compares favorably with that based on plastic zone correction (K{sub IC}).
- OSTI ID:
- 62979
- Report Number(s):
- CONF-941016--; ISBN 0-87339-247-7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanical properties of several magnesium and aluminum composites. Final report
Particle weakening in superplastic SiC/2124 Al composites at high temperature
Related Subjects
ALUMINIUM BASE ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
DISLOCATIONS
EXPERIMENTAL DATA
FRACTURE MECHANICS
FRACTURE PROPERTIES
IRON ADDITIONS
MAGNESIUM ADDITIONS
MICROSTRUCTURE
NOTCHES
PARTICLE SIZE
SAMPLE PREPARATION
SILICON ADDITIONS
SILICON CARBIDES
STRESS INTENSITY FACTORS
TENSILE PROPERTIES
ZINC ADDITIONS