Formation of Nanocrystalline Phases During Thermal Decomposition of Amorphous Ni-P Alloys by Isothermal Annealing

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Abstract:

The microstructure and the average grain size were investigated by x-ray diffraction and transmission electron microscopy for nanocrystalline (n) Ni-P alloys with 18, 19, and 22 at.% P. A detailed study of the nanocrystalline states obtained along different heat treatment routes has been performed: (1) a → ni by isothermal annealing of the melt-quenched amorphous (a) Ni-P alloys; (2) ni → nii by isothermal annealing of the nanocrystalline ni state; (3) ni → nil by linear heating of the ni state. The heats evolved during the structural transformations were determined by differential scanning calorimetry. From these studies, a scheme of the structural transformations and their energetics was constructed, which also includes previous results on phases obtained by linear heating of the as-quenched amorphous state of the same alloys. Grain boundary energies also have been estimated. In some cases it was necessary to assume a variation of the specific grain boundary energy during the phase transformation to understand the enthalpy and microstructure changes during the different heat treatments.

Keywords: DIFFERENTIAL SCANNING CALORIMETRY; ISOTHERMAL ANNEALING; NANOCRYSTALLINE PHASES; NI-P ALLOYS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2001.020

Affiliations: 1: Department of General Physics, Eötvös University, P.O.B. 32, H-1518 Budapest, Hungary 2: Department of Solid State Physics, Eötvös University, P.O.B. 32, H-1518 Budapest, Hungary 3: Honeywell Amorphous Metals, 101 Columbia Road, Morristown, New Jersey 07962-1057, USA 4: Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O.B. 49, H-1525 Budapest, Hungary

Publication date: June 1, 2001

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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