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Influence of Mixing Technique on the Mechanical Properties and Structural Evolution of Al-NiAl Composites

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Abstract

Fabrication and processing of 99.7% purity aluminum powder reinforced with 0, 5, 10% volume fractions NiAl intermetallic metal matrix composites were conducted. The mechanically alloyed nanostructured NiAl was mixed by both regular and high energy ball milling techniques. Powders of NiAl employed for reinforcement were milled for 18 and 31 h, and therefore denoted as NiAl18 and NiAl31, respectively. The mixed powders were consolidated via a combination of cold pressing followed by hot extrusion at 480 °C for 1 h at a reduction ratio 4:1. Hardness, tensile properties, and fracture behavior of the extruded composite powders were evaluated. Structural evolution of the milled composite powders was investigated before and after extrusion using optical microscopy, field emission scanning, and transmission electron microscopy. In addition, particle type identification was carried out via energy dispersive x-ray analysis. Introducing NiAl31 (0.8 µm) enhanced the mechanical properties of the composites compared to NiAl18 (1.0 µm). Moreover, powders milling enhanced the tensile properties post hot extrusion compared to the mixed conditions due to the enhanced reinforcement distribution and bonding with the Al matrices. Hot extruded milled composite powders of Al reinforced with 10% NiAl31 produced nanostructured high-angle grain boundary structure <200 nm.

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Authors and Affiliations

  1. Department of Mechanical Engineering, The American University in Cairo, Cairo, Egypt

    M. Abd Elhamid

  2. Department of Manufacturing Engineering, The Canadian International College, Cairo, Egypt

    Mohamed M. Emara

  3. Department of Mechanical Engineering, The Yousef Jameel Science and Technology Research Center (YJ-STRC), The American University in Cairo, Cairo, Egypt

    Hanadi G. Salem

Authors
  1. M. Abd Elhamid
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  2. Mohamed M. Emara
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  3. Hanadi G. Salem
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Correspondence to Mohamed M. Emara.

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Abd Elhamid, M., Emara, M.M. & Salem, H.G. Influence of Mixing Technique on the Mechanical Properties and Structural Evolution of Al-NiAl Composites. J. of Materi Eng and Perform 23, 3425–3435 (2014). https://doi.org/10.1007/s11665-014-1138-x

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  • DOI: https://doi.org/10.1007/s11665-014-1138-x

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