Phase Transformation in Al₃Ni₂ Alloy during Mechanical Alloying and Heating of Milling Products

Abstract:

An elemental powder mixture corresponding to the Al₃Ni₂ phase stoichiometry was subjected to mechanical alloying in a high-energy ball mill. Products of this process after various milling times were investigated by differential scanning calorimetry. The phase transformations occurring in the material throughout milling and during heating in a calorimeter were investigated by X-ray diffraction method. This study revealed that a metastable nanocrystalline NiAl intermetallic phase was formed during the mechanical alloying process. Heating of the synthesised powders in the calorimeter caused phase transformations, the product of which was an equilibrium Al₃Ni₂ intermetallic phase or a mixture of NiAl, Al₃Ni₂ and Al₃Ni intermetallic phases, depending on the milling time and the temperature up to which the material was heated.

• Periodical: Solid State Phenomena (Volumes 203-204)
• Pages: 272-275
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.203-204.272
• Online since: June 2013
• Authors: Marek Krasnowski, Tadeusz Kulik
• Keywords: Al₃Ni₂ Intermetallic, DSC, Mechanical Alloying, Nanocrystalline Alloys, X-Ray Diffraction (XRD)

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