Scalling approach to describe the nanocrystallization kinetics in Al based bulk amorphous alloys.

• Autorzy: Fazakas, E. , Varga, L.K.
• Konferencja: International Conference on Fabrication and Properties of Metallic Nanomaterials, Warsaw, 17-19 June, 2004.
• Języki publikacji: EN

Abstrakty

EN

The scalling approach was found to apply to the nano-crystallization stage in the framework of the Johnson-Mehl-Avrami theory of nucleation and growth phenomena. By rescalling the time axis for each annealing temperature, the data fall on a universal curve of the JMA form x(tau) = 1 - exp(- tau n In 2), where tau = t/t1/2, with t1/2 = t1/2 (Tann) is related to the nucleation rate and is taken the time at which crystallization is 50% complete. The scalling time parameter, t1/2, was found to diverge with decreasing annealing temperature, defining a characteristic freezing temperature, Tf. Ts parameter can be fitted to a Williams-Landel-Ferry temperature dependence, suggesting a correlation between Tf and Tg (the glass transition temperature).

Słowa kluczowe

PL

nanokrystalizacja; kinetyka; stop aluminium; stop amorficzny

EN

nanocrystalization; kinetics; aluminium alloy; amorphous alloy

• Czasopismo: Archives of Materials Science
• Rocznik: 2004
• Tom: Vol. 25, nr 4
• Strony: 365-372

Twórcy

autor

Fazakas, E.

• Research Institute for Solid State Physics and Optics, 1525 Budapest, P.O.B. 49, Hungary

autor

Varga, L.K.

• Research Institute for Solid State Physics and Optics, 1525 Budapest, P.O.B. 49, Hungary

• Research Institute for Solid State Physics and Optics, 1525 Budapest, P.O.B. 49, Hungary

Bibliografia

• [1] Y. Yamada, N. Hamaya, J. D. Axe, Shapiro, Phys. Rev. Lett., 53, 1665 (1984).
• [2] G. F. Mazenko, O. T. Walls, F. C. Zhang, Phys. Rev. B, 31, 4453 (1985).
• [3] Y. Horie, T. Fukami, S. Mase, Sol. State Comm., 62, 471 (1987).
• [4] A. L. Greer, Acta Metal., 30, 171 (1982).
• [5] M. Cyrot, Phys. Lett., 83A, 275 (1981).
• [6] M. L. Williams, R. L. Landel, J. D. Ferry, J. Am. Chem. Soc., 77, 3701 (1955).