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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

Elsevier

Director: Ministerio de Ciencia e Innovación (Espanya)
Autor: Louidi, S.
Bentayeb, F. Z.
Tebib, W.
Suñol Martínez, Joan Josep
Escoda i Acero, Ma. Lluïsa
Mercier, A.M.
Data: 15 febrer 2012
Resum: 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
Accés al document: http://hdl.handle.net/10256/12836
Llenguatge: eng
Editor: Elsevier
Col·lecció: info:eu-repo/semantics/altIdentifier/doi/10.1016/j.matchemphys.2011.12.008
info:eu-repo/semantics/altIdentifier/issn/0254-0584
info:eu-repo/grantAgreement/MICINN//MAT2009-13108-C02-02/ES/Propiedades Funcionales De Microsistemas Basados En Aleaciones Magneticas Amorfas Y Cristalinas Obtenidos Mediante Enfriamiento Ultrarrapido/
Drets: Tots els drets reservats
Matèria: Nanoestructures
Nanostructures
Aliatges
Alloys
Títol: Stacking faults and phase transformations study in ball milled Co100−xCrx (x = 0, 20, 50) alloys
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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