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Stacking faults and phase transformations study in ball milled Co100−xCrx (x = 0, 20, 50) alloys

The structural evolution and the phase transformations occurred during milling process of Co 100-xCr x (x = 0, 20, 50) alloys are investigated by X-ray diffraction. Microstructural parameters such as the crystallites size, the microstrains, the stacking faults, the dislocation density and the phase fraction were determined from the Rietveld refinement of the X-ray diffraction patterns. The results show the formation of nanostructured alloys which depend on the initial composition of the mixture. In addition, X-ray diffraction indicates that the ball milling induces the fcc to hcp phase transformation in the first stage of milling and the reverse hcp to fcc phase transformation at the end of milling. On the basis of Warren’s model, these allotropic transformations were explained by the presence of dislocations and the accumulation of stacking faults in the hcp and the fcc structures

Financial support from MICYT MAT2009-13108-C02-02 (FEDER) and DURSI 2009SGR-00374 projects is acknowledged

© Materials Chemistry and Physics, 2012, vol. 132, núm. 2-3, p. 761-765

Elsevier

Author: Louidi, S.
Bentayeb, F. Z.
Tebib, W.
Suñol Martínez, Joan Josep
Escoda i Acero, Ma. Lluïsa
Mercier, A.M.
Date: 2012 February 15
Abstract: The structural evolution and the phase transformations occurred during milling process of Co 100-xCr x (x = 0, 20, 50) alloys are investigated by X-ray diffraction. Microstructural parameters such as the crystallites size, the microstrains, the stacking faults, the dislocation density and the phase fraction were determined from the Rietveld refinement of the X-ray diffraction patterns. The results show the formation of nanostructured alloys which depend on the initial composition of the mixture. In addition, X-ray diffraction indicates that the ball milling induces the fcc to hcp phase transformation in the first stage of milling and the reverse hcp to fcc phase transformation at the end of milling. On the basis of Warren’s model, these allotropic transformations were explained by the presence of dislocations and the accumulation of stacking faults in the hcp and the fcc structures
Financial support from MICYT MAT2009-13108-C02-02 (FEDER) and DURSI 2009SGR-00374 projects is acknowledged
Format: application/pdf
ISSN: 0254-0584
Document access: http://hdl.handle.net/10256/12836
Language: eng
Publisher: Elsevier
Collection: MICINN/PN2010-2013/MAT2009-13108-C02-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.matchemphys.2011.12.008
Articles publicats (D-F)
Is part of: © Materials Chemistry and Physics, 2012, vol. 132, núm. 2-3, p. 761-765
Rights: Tots els drets reservats
Subject: Nanoestructures
Nanostructures
Aliatges
Alloys
Title: Stacking faults and phase transformations study in ball milled Co100−xCrx (x = 0, 20, 50) alloys
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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