Authors: Ádám Révész¹; János Lendvai¹; Ágnes Cziráki²; Howard H. Liebermann³; Imre Bakonyi⁴

Source: Journal of Nanoscience and Nanotechnology, Volume 1, Number 2, June 2001 , pp. 191-200(10)

Publisher: American Scientific Publishers

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 n_i by isothermal annealing of the melt-quenched amorphous (a) Ni-P alloys; (2) n_i n_ii by isothermal annealing of the nanocrystalline n_i state; (3) n_i n_il by linear heating of the n_i 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: NI-P ALLOYS; ISOTHERMAL ANNEALING; NANOCRYSTALLINE PHASES; X-RAY DIFFRACTION; TRANSMISSION ELECTRON MICROSCOPY; DIFFERENTIAL SCANNING CALORIMETRY

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: 2001-06-01

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