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

Published online by Cambridge University Press:  31 January 2011

Uma M.R. Seelam ,
Gagik Barkhordarian  and
Challapalli Suryanarayana
Uma M.R. Seelam
Affiliation:
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816-2450
Gagik Barkhordarian
Affiliation:
Department Powder and NanoTechnology, Institute for Materials Research, GKSS Research Center Geesthacht GmbH, D-21502, Geesthacht, Germany
Challapalli Suryanarayana*
Affiliation:
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816-2450
*
a) Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

Mechanical alloyingPhase transformationX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3454 - 3461
Copyright
Copyright © Materials Research Society 2009

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