Effect of heat treatment on microstructure and interface of SiC particle reinforced 2124 Al matrix composite |
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| Affiliation: | 1. MEF Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;2. Dept of Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL, USA;1. Department of Mechanical Engineering, Motilal Nehru Government Polytechnic College, Puducherry, 605008, India;2. Department of Mechanical Engineering, Saveetha School of Engineering, Saveetha University, Chennai, 602105, Tamilnadu, India;3. Department of Mechanical Engineering, Adhiparasakthi Engineering College, Melmaruvathur, 603319, Tamilnadu, India;4. Department of Mechanical Engineering, University College of Engineering, Nagercoil, Tamilnadu, 629004, India;5. Department of Civil Engineering, Motilal Nehru Government Polytechnic College, Puducherry, 605008, India;6. Department of Chemistry, Motilal Nehru Government Polytechnic College, Puducherry, 605008, India;1. Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street No. 5988, Changchun, Jilin Province 130025, PR China;2. Department of Mechanical Engineering, Oakland University, Rochester, MI 48309, United States;3. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130012, PR China |
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| Abstract: | The microstructure and interface between metal matrix and ceramic reinforcement of a composite play an important role in improving its properties. In the present investigation, the interface and intermetallic compound present in the samples were characterized to understand structural stability at an elevated temperature. Aluminum based 2124 alloy with 10 wt.% silicon carbide (SiC) particle reinforced composite was prepared through vortex method and the solid ingot was deformed by hot rolling for better particle distribution. Heat treatment of the composite was carried out at 575 °C with varying holding time from 1 to 48 h followed by water quenching. In this study, the microstructure and interface of the SiC particle reinforced Al based composites have been studied using optical microscopy, scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), electron probe micro-analyzer (EPMA) associated with wavelength dispersive spectroscopy (WDS) and transmission electron microscopy (TEM) to identify the precipitate and intermetallic phases that are formed during heat treatment. The SiC particles are uniformly distributed in the aluminum matrix. The microstructure analyses of Al–SiC composite after heat treatment reveal that a wide range of dispersed phases are formed at grain boundary and surrounding the SiC particles. The energy dispersive X-ray spectroscopy and wavelength dispersive spectroscopy analyses confirm that finely dispersed phases are CuAl2 and CuMgAl2 intermetallic and large spherical phases are Fe2SiAl8 or Al15(Fe,Mn)3Si. It is also observed that a continuous layer enriched with Cu and Mg of thickness 50–80 nm is formed at the interface in between Al and SiC particles. EDS analysis also confirms that Cu and Mg are segregated at the interface of the composite while no carbide is identified at the interface. |
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