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Microstructures and Tensile Properties of Hot-Extruded Al Matrix Composites Containing Different Amounts of Al4Sr

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Abstract

In this investigation, the effect of hot extrusion process has been studied on the microstructure and tensile properties of aluminum matrix composite containing different amounts (10, 15, and 20 wt pct) of Al4Sr intermetallic phase. Microstructural examinations assessed by scanning electron microscopy revealed that hot extrusion breaks large Al4Sr particles and reduces their length tremendously. It was also found that although the addition of Al4Sr content in the composite reduces ultimate tensile strength and elongation values, hot extrusion improves tensile results significantly. Remarkable result of this study was concerned with significant improvement in the toughness of hot-extruded Al-10 wt pct Al4Sr composite in which elongation values raised up to 22 pct. Therefore, optimum amount of Al4Sr intermetallic in the composite was found to be 10 wt pct. Fractographic examinations revealed that hot extrusion encourages ductile mode of fracture by introducing homogeneous distribution of fine dimples on the fracture surface of the composites.

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Acknowledgments

The authors gratefully acknowledge University of Tehran for financial support of this work.

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Authors and Affiliations

  1. School of Metallurgy and Materials, College of Engineering, University of Tehran, P.O. Box 14395-731, Tehran, Iran

    K. Sharifian (BSc), M. Emamy (Professor) & K. Tavighi (MSc)

  2. Imam Khomeini International University, Qazvin, Iran

    S. E. Vaziri Yeganeh (MSc)

Authors
  1. K. Sharifian
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  2. M. Emamy
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  3. K. Tavighi
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  4. S. E. Vaziri Yeganeh
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Correspondence to M. Emamy.

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Manuscript submitted January 12, 2014.

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Sharifian, K., Emamy, M., Tavighi, K. et al. Microstructures and Tensile Properties of Hot-Extruded Al Matrix Composites Containing Different Amounts of Al4Sr. Metall Mater Trans A 45, 5344–5350 (2014). https://doi.org/10.1007/s11661-014-2503-y

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