Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 592, Issue -, Pages 121-127Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.11.006
Keywords
Nanocomposites; Ultra-fine structured materials; Compocasting; Cross accumulative roll bonding; High-strength materials; Mechanical properties
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In order to achieve a refine microstructure along with improvement of mechanical properties of cast All 2 vol% SiCp nanocomposite, cross accumulative roll bonding (CARB) process was employed. Optical and electron microscopies, the Archimedes method, and tensile test were used to evaluate microstructural evolution and mechanical properties of the nanocomposites during CARB cycles. Results showed that the microstructure of the nanocomposite after eight cycles of CARB had homogenous distribution of SiC nanoparticles in aluminum matrix without any remarkable porosity. The results of transmission electron microscopy showed that ultra-fine structured Al/SiCp nanocomposite was successfully achieved by employing eight cycles of CARB technique. Also, the tensile strength and the elongation of the nanocomposite increased as the number of CARB cycles increased. After eight CARB cycles, ultimate tensile strength and the elongation values reached 354 MPa and 6.9%, which were 3.22 and 328 times greater than those of the as-cast nanocomposites, respectively. Strengthening mechanisms were explained by strain hardening, grain refinement, reinforcing role of nanoparticles, uniformity of reinforcement and porosity. (C) 2013 Elsevier B.V. All rights reserved.
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