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Technologie laserowe w inżynierii materiałowej

Kusiński J.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

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2005

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Z. 82

27-32

PL

Na podstawie badań własnych oraz współpracowników, jak również obserwacji poczynionych podczas licznych konferencji krajowych i zagranicznych, analizy tematyki grantów KBN oraz literatury w artykule omówiono podstawy procesów technologicznych, w których wykorzystywane są lasery. Wynikami badań własnych zilustrowano procesy: nanokrystalizacji oraz ablacji laserowej.

EN

On the basis of personal and coworkers research, as well as observations made during several national and international conferences dedicated to thelasers and analysis of literature, the basics of different laser technologies are described in the paper. The paper presents mainly two techniques: laser nanocrystallization of amorphous materials and laser ablation.

2

Nanokrystaliczna tlenofluorkowa szkłoceramika.

Środa M., Reben M., Wacławska I., Kuciński G.

Szkło i Ceramika

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2004

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R. 55, nr 4

29-33

EN

Nanocrystallization of LaF, in glass from the SiO2-Al2O3-Na2O-LaF, system has been studied. The correlation between glass composition and the effect of the ceramization of LaF, has been found. The thermal stability of the glass was investigated by DTA method. A size of the nanocrystallites was obtained by TMA observation as well as Scherrer's calculation of XRD data with respect to the time of the heat treatment. Effect of the ceramization process on the absorbence of the glass at the range 200-1100 nm was determined.

3

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

Fazakas E., Varga L.K.

Archives of Materials Science

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2004

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Vol. 25, nr 4

365-372

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).

4

Nanocrystallization of Al-rare earth amorphous alloys studied in-situ by real-time X-ray diffraction.

Antonowicz J.

Archives of Materials Science

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2004

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Vol. 25, nr 4

351-356

EN

Nanocrystallization of five binary Al-RE (RE = rare earth) amorphous alloys was investigated in-situ using the real-time X-ray diffraction technique. Crystalline volume friction and mean grain size time evolutions during isothermal annealing were calculated. The average nanocrystal size was found to be nearly constant during the transformation progress in all investigated systems. The results indicate that the nanocrystallization process is controlled by the nucleation rate and the diffusion controlled growth plays minor role in overall transformation kinetics.