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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 329Study of Nanocrystalline NiAl Alloys Prepared by...

Study of Nanocrystalline NiAl Alloys Prepared by Mechanical Alloying

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Abstract:

Nanostructured Powders of Ni-20wt%Al and Ni-50wt%Al Were Prepared, by Mechanical Alloying under an Argon Atmosphere, from Elemental Ni and Al Powders Using a Planetary Ball Mill (type Fritsch P7) for Different Times (0.5-24h).). Microstructural and Structural Features of the Final Products Were Characterized by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). the Results of the XRD Shows the Formation of the B2 (Ni Al) Phase after 2 Hours of Milling for both Systems. Also Detected Was the Ni₃al Phase in Ni₈₀al₂₀ after 4 Hours. Crystallite Size Refinement of the Final Product Occurred down to Nanometer Scales when the Milling Time Increased, and Attained 17 Nm in the Ni₅₀al₅₀ System and 20 Nm in the other System, at 24 Hours. this Decrease in Crystallite Size Is Accompanied by an Increase in the Interval Level Strain. the Kinetics of Al Dissolution during the Milling Process of Ni₅₀al5₀ System Can Be Described by Two Regimes, Characterised by Different Values of Avrami Parameters which Are Calculated by Using the Johnson–Mehl–Avrami Formalism.

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Periodical:

Defect and Diffusion Forum (Volume 329)

Pages:

19-28

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.329.19

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Online since:

July 2012

Authors:

M. Gherib, A. Otmani, A. Djekoun, A. Bouasla, M. Poulain, M. Legouira

Keywords:

Kinetic, Mechanical Alloying (MA), Nanomaterial, Ni-Al Alloys, Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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