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Microstructure, mechanical analysis and optimal selection of 7075 aluminum alloy based composite reinforced with alumina nanoparticles

Ezatpour, H. R ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matchemphys.2016.04.078
  3. Publisher: Elsevier Ltd , 2016
  4. Abstract:
  5. Aluminum metal-matrix nanocomposites (AMMNCs) fabricated by conventional stir-casting process usually show high porosity and poor distribution of nanoparticles within the matrix. In the current study, for the improvement of nanoparticles distribution in the aluminum matrix and enhancement of the mechanical properties, a mixture of Al/nano-Al2O3 powders were injected by pure argon gas into the molten 7075 aluminum alloy and this mixture was extruded at high temperature. Mechanical behavior of the final product was investigated by tensile and compression tests, hardness measurements, Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM) and Optical Microscopy. This nanocomposite exhibited some superior properties such as a fine grain microstructure and a reasonable uniform distribution of nanoparticles in the matrix. Mechanical experiments results confirmed that the addition of Al2O3 nanoparticles and the extrusion process effectively improved ultimate tensile strength, compression strength and hardness. In next step, we used a Preference Selection Index (PSI) materials selection method to select best combination of strength and workability of Al7075Al2O3 nanocomposites. By this method, extruded Al7075/0.4 and 0.8 wt % Al2O3 has best combination of strength and workability
  6. Keywords:
  7. Preference selection index method ; Tensile and compressive properties ; Alumina ; Aluminum ; Aluminum alloys ; Argon ; Compression testing ; Electron microscopy ; Extrusion ; Hardness ; Metal nanoparticles ; Metallic matrix composites ; Microstructure ; Mixtures ; Nanocomposites ; Nanoparticles ; Scanning electron microscopy ; Tensile strength ; Alumina Nanoparticle ; Aluminum metal matrixes ; Compression strength ; Compressive properties ; Hardness measurement ; Microstructure properties ; Preference selection ; Ultimate tensile strength ; High resolution transmission electron microscopy
  8. Source: Materials Chemistry and Physics ; Vol 178 , August , 2016 , Pages 119–127 ; 02540584 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S025405841630298X