On the role of pin geometry in microstructure and mechanical properties of AA7075/SiC nano-composite fabricated by friction stir welding technique |
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| Affiliation: | 1. Faculty of Mining and Materials Engineering, Amirkabir University of Technology (AUT), Hafez Ave., Tehran, Iran;2. Department of Mechanical Engineering, University of Tehran, Tehran, Iran;1. Department of Mechanical Engineering, St. Peter''s University, Chennai 600054, Tamil Nadu, India;2. Department of Mechanical Engineering, Prasanna College of Engineering and Technology, Belthangady 574214, Karnataka, India;3. Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg 2006, South Africa;4. Department of Mechanical Engineering, Madanapalle Institute of Technology and Science, Madanapalle 517325, Andhra Pradesh, India;1. Department of Mechanical Engineering, Faculty of Engineering-Architecture, Batman University, Batman, Turkey;2. Department of Mechanical Engineering, Faculty of Engineering, Inonu University, Malatya, Turkey;1. Faculty of Engineering, University of Kashan, Kashan, Iran;2. Department of Mining and Metallurgy, Amirkabir University of Technology, Tehran, Iran;1. Faculty of Mining and Materials Engineering, Amirkabir University of Technology (AUT), Hafez Aveenue, Tehran, Iran;2. Department of Mechanical Engineering, University of Tehran, Tehran, Iran |
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| Abstract: | The main purpose of this research is to investigate the influence of pin geometry on the macrostructure, microstructure and mechanical properties of the friction stir welds, reinforced with SiC nano-particles. Toward this end, friction stir welding (FSW) conducted using five geometrically different pin tools. Other welding parameters were remained unchanged. Microstructural evaluation using optical microscopy (OM) and scanning electron microscopy (SEM) revealed a banded structure consisting of particle-rich and particle-free regions in stir zone (SZ). The most uniform particle distribution was found in the case of using threaded tapered pin tool. On the other hand, it was discovered that the reinforcements had severely accumulated in the SZ of specimen friction stir welded (FSWed) with four-flute cylindrical pin tool. Moreover, threaded tapered and four-flute cylindrical specimens showed the highest and the lowest microhardness, respectively. In spite of four-flute cylindrical specimen, other specimens failed in base metal during tensile testing. Besides, the highest ultimate tensile strength (UTS) was recorded for the specimen FSWed with triangular pin tool. Fracture surface of tensile specimens were also studied employing SEM technique. |
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| Keywords: | Friction stir welding Metal–matrix composites Mechanical properties Microstructures Pin geometry |
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