Is there a hexagonal-close-packed (hcp) -> face-centered-cubic (fcc) allotropic transformation in mechanically milled Group IVB elements?

    Authors

    U. M. R. Seelam; G. Barkhordarian;C. Suryanarayana

    Comments

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    Abbreviated Journal Title

    J. Mater. Res.

    Keywords

    METASTABLE PHASE-FORMATION; NANOCRYSTALLINE MATERIALS; NANOSTRUCTURED; MATERIALS; GRAIN-BOUNDARIES; AL POWDERS; TITANIUM; MULTILAYERS; ATTRITION; EQUATION; METALS; Materials Science, Multidisciplinary

    Abstract

    Allotropic hexagonal-close-packed (hcp) - > face-centered-cubic (fcc) transformations were reported in Group IVB elements titanium (Ti), zirconium (Zr), and hafnium (Hf) subjected to mechanical milling in a high-energy SPEX shaker mill. Although the transformation was observed in powders milled under regular conditions, no such phase transformation was observed when the powders were milled in an ultrahigh purity environment by placing the powder in a milling container under a high-purity argon atmosphere, which was in turn placed in an argon-filled glove box for milling. From a critical analysis of the results, it was concluded that the hcp - > fcc phase transformation was, at least partially, due to pick-up of interstitial impurities by the powder during milling of these powders to the nanocrystalline state.

    Journal Title

    Journal of Materials Research

    Volume

    24

    Issue/Number

    11

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    3454

    Last Page

    3461

    WOS Identifier

    WOS:000271352200025

    ISSN

    0884-2914

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