Production of aluminum alloy-based metal matrix composites using scrap aluminum alloy and waste materials: Influence on microstructure and mechanical properties
| Autor: | John Victor Christy, R. Muraliraja, Ramanathan Arunachalam, Abdel-Hamid I. Mourad, Majid Al-Maharbi, Majumder Manik Chandra, Venkatraman Murali, Pradeep Kumar Krishnan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Alloy chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Aluminium Ultimate tensile strength Materials Chemistry Aluminium alloy Composite material Eutectic system Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Microstructure Casting 0104 chemical sciences Compressive strength chemistry Mechanics of Materials visual_art visual_art.visual_art_medium engineering 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 784:1047-1061 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.01.115 |
| Popis: | In the present study, aluminium metal matrix composites (AMCs) were successfully produced through stir-squeeze casting using a novel approach. The feasibility of using car scrap aluminium alloy wheels (SAAWs) as the matrix material and spent alumina catalyst (SAC) from oil refineries as reinforcement material was investigated. For the purpose of comparision, composites were also produced using AlSi7Mg (LM25 grade) aluminium alloy as a matrix and alumina as reinforcement particles through the stir-squeeze casting process. In total, four different combinations of composites (AlSi7Mg + alumina; scrap aluminium alloy + alumina; AlSi7Mg + spent alumina catalyst; scrap aluminium alloy + spent alumina catalyst) were produced and characterized. Microstructural investigations using an optical microscope and a scanning electron microscope (SEM) as well as energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) revealed that in all four composites the reinforcement formed a mixture in the eutectic silicon phase of the matrix alloy. The alumina particles' size and content ratio greatly influenced this mixture's formation and morphology. The composites produced using alumina exhibited smaller pore sizes and lower porosity as compared to the composites produced with a spent alumina catalyst. Superior mechanical properties were also obtained when using alumina as reinforcement, and better mechanical properties can mainly be attributed to the morphology of the reinforcement and silicon eutectic phase mixture. The scrap aluminium alloy + alumina exhibited the lowest porosity (7.3%) and abrasive wear loss (0.11 mg for the finest abrasive), highest hardness (58.5 BHN), and second highest ultimate tensile strength (UTS) (125 MPa) and ultimate compressive strength (UCS) (312 MPa) among the four composites. |
| Databáze: | OpenAIRE |
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