Thermal Stability, Microstructure and Mechanical Properties of Nanostructured Al-Ni-Mm-X (X = Cu and Fe) Alloys Hot-Extruded from Gas-Atomized Powders

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  • Kim H. S.
    Dept. of Nano System Engineering, Pusan National University
  • Sohn Y. H.
    Advanced Materials Processing and Analysis Center (AMPAC), Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida
  • Kim T. G.
    Dept. of Nano System Engineering, Pusan National University
  • Koo J. M.
    Division of Advanced Materials Engineering, Kongju National University
  • Hong S. J.
    Division of Advanced Materials Engineering, Kongju National University

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説明

The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of Al85-Ni8.5-Mm6.5, Al84-Ni8.5-Mm6.5Cu1, Al84-Ni8.5-Mm6.5Fe1 alloys, manufactured by gas atomization, degassing and hot-extrusion were investigated. All hot-extruded alloys consisted of homogeneously-distributed fine-grained fcc-Al matrix and intermetallic compounds. A substitution of 1 at% Al by Cu increased the thermal stability of the amorphous phase and produced alloy microstructure with smaller fcc-Al grains. On ther other hand, the same substitution of 1 at% Al by Fe decreased the stability of the amorphous phase and produced larger fcc-Al grains. The formation of intermetallic compounds such as Al3Ni, Al11Ce3 and Al11La3 was suppressed by the addition of Cu or Fe. Among the three alloys examined, the highest Vickers hardness and compressive strength were obtained for Al84-Ni8.5-Mm6.5Cu1 alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition.

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