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Microstructure Characterization, Mechanical, and Tribological Properties of Slow-Cooled Sb-Treated Al-20Mg2Si-Cu In Situ Composites

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Abstract

Role of Sb addition on structural characteristics, mechanical properties, and wear behavior of Al-20Mg2Si-Cu in situ composite under slow cooling condition was thoroughly investigated in this study using stereomicroscopy, optical and scanning electron microscopy, thermal analysis, tensile, impact, hardness tests, and wear tester. Results show that addition of 0.8 wt.% Sb was found to produce a change in the morphology of primary Mg2Si from dendrite to fine polygonal shape. At this Sb addition, the primary Mg2Si phase also exhibited a reduction in size from 179.4 to 128.6 μm, an increase in density of Mg2Si per area from 12.5 to 32.2 particle/mm2, and a decrease in the aspect ratio from 1.24 to 1.11. Increasing the amount of Sb added up to 1 wt.% also resulted in a decrease in both nucleation and growth temperatures of the eutectic Mg2Si by 2.6 and 1.7 °C respectively, which is most likely due to change of eutectic Mg2Si morphology from flake to fibrous structure. Thermal analysis technique showed that distribution of Mg2Si particles influences the heat conductivity during the solidification process of Al-Mg2Si composite. The results also showed that improvements in mechanical properties of composite were obtained with increasing Sb content due to modification of both primary and eutectic Mg2Si and due to intermetallic compound transformation from β-Al5FeSi to α-Al15(Fe,Mn)3Si2. Examination of fracture surfaces from tensile and impact samples showed that the base composite failed in a brittle manner with decohered or debonded Mg2Si particles, whereas the 0.8 wt.% Sb-treated composite showed more cracked Mg2Si and ductile fracture in the matrix. Wear properties improved significantly with addition of Sb due to modification and better dispersion of fine Mg2Si particles in matrix.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, Buein Zahra Technical University, Qazvin, 3451745346, Iran

    Saeed Farahany

  2. Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), 81310, Johor Bahru, Malaysia

    Hamidreza Ghandvar & Nur Azmah Nordin

  3. Department of Mechanical Engineering, Faculty of Engineering, University of Ottawa, Ottawa, ON, Canada

    Ali Ourdjini

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  1. Saeed Farahany
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  4. Ali Ourdjini
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Correspondence to Saeed Farahany.

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Farahany, S., Ghandvar, H., Nordin, N.A. et al. Microstructure Characterization, Mechanical, and Tribological Properties of Slow-Cooled Sb-Treated Al-20Mg2Si-Cu In Situ Composites. J. of Materi Eng and Perform 26, 1685–1700 (2017). https://doi.org/10.1007/s11665-017-2624-8

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