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Metals 2017, 7(9), 359;

Effect of Al2O3 Nanoparticles as Reinforcement on the Tensile Behavior of Al-12Si Composites

School of Materials Engineering, Shanghai University of Engineering Science, 201620 Shanghai, China
School of Materials Science and Engineering, Shanghai University, 200444 Shanghai, China
Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, 222815 Gjøvik, Norway
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria
Authors to whom correspondence should be addressed.
Received: 16 August 2017 / Revised: 5 September 2017 / Accepted: 7 September 2017 / Published: 10 September 2017
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Al2O3 nanoparticle-reinforced Al-12Si matrix composites were successfully fabricated by hot pressing and subsequent hot extrusion. The influence of weight fraction of Al2O3 particles on the microstructure, mechanical properties, and the corresponding strengthening mechanisms were investigated in detail. The Al2O3 particles are uniformly distributed in the matrix, when 2 and 5 wt. % of Al2O3 particles were added to the Al-12Si matrix. Significant agglomeration can be found in composites with 10 wt. % addition of Al2O3 nanoparticles. The maximum hardness, the yield strength, and tensile strength were obtained for the composite with 5 wt. % Al2O3 addition, which showed an increase of about ~11%, 23%, and 26%, respectively, compared with the Al-12Si matrix. Meanwhile, the elongation increased to about ~30%. The contribution of different mechanisms including Orowan strengthening, thermal mismatch strengthening, and load transfer strengthening were analyzed. It was shown that the thermal mismatch strengthening has a more significant contribution to strengthening these composites than the Orowan and load transfer strengthening mechanisms. View Full-Text
Keywords: Al metal matrix composites; microstructure; mechanical properties; strengthening mechanism Al metal matrix composites; microstructure; mechanical properties; strengthening mechanism

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Ma, P.; Jia, Y.; Konda Gokuldoss, P.; Yu, Z.; Yang, S.; Zhao, J.; Li, C. Effect of Al2O3 Nanoparticles as Reinforcement on the Tensile Behavior of Al-12Si Composites. Metals 2017, 7, 359.

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