Influence of Al 2 O 3 Nanoparticles on Microstructure and Strengthening Mechanism of Al-Based Nanocomposites Produced vi
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JMEPEG DOI: 10.1007/s11665-017-2699-2
Influence of Al2O3 Nanoparticles on Microstructure and Strengthening Mechanism of Al-Based Nanocomposites Produced via Spark Plasma Sintering B. Sadeghi, M. Shamanian, F. Ashrafizadeh, P. Cavaliere, and A. Rizzo (Submitted February 3, 2017; in revised form April 6, 2017) Spark plasma sintering (SPS) has been recognized, in the recent past, as a very useful method to produce metal matrix composites with enhanced mechanical and wear properties. Obviously, the materialsÕ properties are strongly related to the reinforcement types and percentages as well as to the processing parameters employed during synthesis. The present paper examines the effect of 2 wt.% of Al2O3 nanoparticles on mechanical and microstructural behaviors of Al-based metal matrix composites produced via SPS. The composite mechanical properties were evaluated through micro-, nanoindentation and tensile tests. The microstructural evolution was studied through scanning electron microscopy observations. It was found that the addition of nanoparticles produces the reduction of materials porosity and the improvement of mechanical properties in SPSed materials. Keywords
composites, microscopy, nanomaterials, powder metallurgy, sintering
1. Introduction Recently, nanocomposite has received considerable attention thanks to their unique mechanical properties that are reachable through the addition of low reinforcement volume factions. (Ref 1). The reinforcement of the aluminum ductile matrix with stronger and stiffer second-phase reinforcements such as oxides, carbides, borides and nitrides provides considerable improvements in physical and mechanical properties of nanocomposites (Ref 2). It is well known that the amount, the size and the distribution of hard particles throughout the matrix have a crucial influence on the final properties of nanocomposites (Ref 1-4). The strength of aluminum matrix composite can be improved about 20% by decreasing the reinforcement particle size from micron to nanosize (Ref 3). As a matter of fact, the yield and tensile strength of Al-1vol.% Si3N4 (15 nm) nanocomposite resulted higher with respect to those belonging to Al-15vol.%SiCp (3.5 lm). On the other hand, by adding ceramic nanoparticles, elastic modulus and hardness can be increased (Ref 5). However, homogeneous dispersion of B. Sadeghi, Department of Material Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran and Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy; M. Shamanian and F. Ashrafizadeh, Department of Material Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; P. Cavaliere, Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100 Lecce, Italy; and A. Rizzo, ENEA — Italian National Agency for New Technologies, Energy and the Sustainable Economic Development, Technical Unit for Materials Technologies, Brindisi Research Center, S.S. 7 Appia km. 706, 72100 Brindisi, Italy. Contact e-mail: pasquale.cavaliere@
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