Title

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

Authors

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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