Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 3, Pages 1131-1137Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.11.028
Keywords
Composites; Mechanical properties; Microstructures; Particle size; Particle distribution
Categories
Funding
- National Natural Science Foundation of China [50801068]
- Ph.D. Programs Foundation of Ministry of Education of China [200805331044]
- Chinese Postdoctoral Science Foundation [200801345]
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This paper studied the combined effects of particle size and distribution on the mechanical properties of the SiC particle reinforced Al-Cu alloy composites. It has been shown that small ratio between matrix/reinforcement particle sizes resulted in more uniform distribution of the SiC particles in the matrix. The SiC particles distributed more uniformly in the matrix with increasing in mixing time. It has also been shown that homogenous distribution of the SiC particles resulted in higher yield strength, ultimate tensile strength and elongation. Yield strength and ultimate tensile strength of the composite reinforced by 4.7 mu m sized SiC particles are higher than those of composite reinforced by 77 mu m sized SiC particles, while the elongation shows opposite trend with yield strength and ultimate tensile strength. Fracture surface observations showed that the dominant fracture mechanism of the composites with small SiC particle size (4.7 mu m) is ductile fracture of the matrix, accompanied by the pull-out of the particles from the matrix, while the dominant fracture mechanism of the composites with large SiC particle size (77 mu m) is ductile fracture of the matrix, accompanied by the SiC particle fracture. (C) 2010 Elsevier B.V. All rights reserved.
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