Thermal stability, microstructure and mechanical properties of nanostructured Al-Ni-Mm-X (X = Cu and Fe) alloys hot-extruded from gas-atomized powders

    Authors

    H. S. Kim; Y. H. Sohn; T. G. Kim; J. M. Koo;S. J. Hong

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Mater. Trans.

    Keywords

    rapid solidification; nano-crystalline materials; Al-Ni-Mm; high; strength; thermal stability; AMORPHOUS-ALLOYS; PARTICLES; BEHAVIOR; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

    Abstract

    The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of Al-85-Ni-8.5-Mm(6.5), Al-94-Ni(8.5)Mm(6.5)Cu(1), Al-84-Ni-8.5-Mn16.5Fe1 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 Al-84-Ni-8.5-Mm(6.5)Cu(1) alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition.

    Journal Title

    Materials Transactions

    Volume

    49

    Issue/Number

    6

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    1223

    Last Page

    1228

    WOS Identifier

    WOS:000258160900004

    ISSN

    1345-9678

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