《1351_Grain-growth-in-a-nanocrystalline-Ni81P19-alloy》.pdf

NanoStructured Materials, Vol. 11, No. 8, pp. 1351–1360, 1999 Elsevier Science Ltd Pergamon Copyright © 2000 Acta Metallurgica Inc. Printed in the USA. All rights reserved. 0965-9773/99/$–see front matter PII S0965-9773(00)00432-3 GRAIN GROWTH IN A NANOCRYSTALLINE Ni81P19 ALLOY ´ 1 1 2 A. Re´ve´sz *, J. Lendvai and I. Bakonyi 1 Eo¨tvo¨s University, Department of General Physics, H-1518 Budapest, P.O.B. 32, Hungary 2 Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 49, Hungary (Received May 21, 1999) (Accepted July 1, 1999) Abstract—Isothermal annealing of a Ni81P19 amorphous alloy performed at 600 K for 1200 s resulted in the formation of a nanocrystalline state with 10 nm average grain size. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) measurements were performed to study the influence of further heat treatments. Linear-heating DSC scan starting from the nanocrystalline state revealed a broad exothermic contribution between 600 K and 770 K, corresponding to a grain-growth process. Isothermal annealing of the na