An unusual phase transformation during mechanical alloying of an Fe-based bulk metallic glass composition

    Authors

    U. Patil; S. H. Hong;C. Suryanarayana

    Comments

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    Abbreviated Journal Title

    J. Alloy. Compd.

    Keywords

    bulk metallic glass; X-ray diffraction; Fe-based alloy; mechanical; alloying; phase transformation; AMORPHOUS-ALLOYS; MAGNETIC-PROPERTIES; THERMAL-STABILITY; CRYSTALLIZATION; AMORPHIZATION; POWDERS; SYSTEM; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering

    Abstract

    Mechanical alloying of an Fe-based bulk metallic glass composition (Fe60Co8Zr10Mo5W2B15) was conducted starting from blended elemental powders. A supersaturated solid solution of all the alloying elements in Fe has formed in the initial stages of milling. This alpha-Fe phase became amorphous on subsequent milling up to 20-30 h. Further milling, unexpectedly, led to primary crystallization of the amorphous phase resulting in the formation of an (alpha-Fe)' phase with a slightly smaller lattice parameter (and lower solute content) than that in the early stages of milling. External annealing of the amorphous phase powder at 700degreesC for 1 h led to complete crystallization of the amorphous phase into a mixture of phases including alpha-Fe, ZrFe2, Fe2B, Fe3B, MoB2, FeMo2B2, and at least another unidentified phase. Possible reasons for such an unusual amorphous -- > crystalline transformation on milling in the bulk metallic glass composition are discussed and it was shown that this transformation is due to the combination of defect-assisted diffusion and a slight rise in the powder temperature. (C) 2004 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Alloys and Compounds

    Volume

    389

    Issue/Number

    1-2

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    121

    Last Page

    126

    WOS Identifier

    WOS:000227255300018

    ISSN

    0925-8388

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