Effects of particle size on fatigue crack initiation and small crack growth in SiC particulate-reinforced aluminium alloy composites |
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| Affiliation: | 1. Department of Mechanics Engineering, Shenyang Institute of Aeronautical Engineering, 52 Huanghe Street, Shenyang 110031, China;2. Department of Mechanical and Systems Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan;1. Laboratory of Mechanical Properties of Nanostructural Materials and Superalloys, Belgorod National Research University, Pobeda 85, Belgorod, 308015, Russia;2. Advanced Forming Research Centre (AFRC), University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrew, PA4 9LJ, United Kingdom;1. School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea;2. Implementation Research Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea;1. Department of Mechanical Engineering, Mount Zion College of Engineering and Technology, Pudukkottai, Tamil Nadu, India;2. Assistant Professor, Department of Mechanical Engineering, College Of Engineering, Anna University, Chennai, Tamil Nadu, India;3. Design, Manufacturing & Engineering Management, University of Strathclyde, Glasgow G1 1XJ, Scotland, UK;4. Department of Mechanical Engineering, Imperial College London, Exhibition Rd., SW7 2AZ London, UK;5. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran |
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| Abstract: | Fatigue crack initiation and small crack growth were studied under axial loading using powder metallurgy 2024 aluminum-matrix composites reinforced with SiC particles of three different sizes of 5, 20 and 60 μm. The 5 and 20 μm SiCp/Al composites exhibited nearly the same fatigue strength as the unreinforced alloy, while the 60 μm SiCp/Al composite showed a significantly lower fatigue strength due to its inferior crack initiation resistance that could be attributed to interface debonding between particles and the matrix. Small crack growth behaviour was different depending on stress level. At a low applied stress, the addition of SiC particles enhanced the growth resistance, particularly in the composites reinforced with coarser particles, while at a high applied stress, the 60 μm SiCp/Al composite showed a considerably low growth resistance, which could be attributed to interaction and coalescence of multiple cracks. In the 5 μm SiCp/Al composite, small cracks grew avoiding particles and thus few particles appearing on the fracture surfaces were seen, particularly in small crack size region. In the 20 and 60 μm SiCp/Al composites, they grew along interfaces between particles and the matrix and the number of particles appearing on the fracture surfaces increased with increasing crack size or maximum stress intensity factor. |
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