THE STUDY OF THE CRYSTALLINE STRUCTURE OF THE PHASES IN THE AL-NI ALLOYS  ULTRARAPID SOLIDIFICATION BY THE METHOD OF X RAY DIFFRACTION

Prof. Dr. ing. Lidia CRISTEA; Prof. Dr. Eufrosina OTLACAN; Drd. ing. Enona CRISTEA

THE STUDY OF THE CRYSTALLINE STRUCTURE OF THE PHASES IN THE AL-NI ALLOYS ULTRARAPID SOLIDIFICATION BY THE METHOD OF X RAY DIFFRACTION

Prof. Dr. ing. Lidia CRISTEA, Prof. Dr. Eufrosina OTLACAN, Drd. ing. Enona CRISTEA

Öz

Melt –spinning and melt extraction methods of rapid solidification have been applied on Al-Ni
alloys in the lower and higher composition.
For orientate appreciations of the peripheric speed of the cooling disk it is used the dependence between
the thickness of the solidified fibers and the peripheric speed of the extraction disk.
The cooling speed calculated on the basis of the thermic transfer coefficient in accordance with the
thickness of the fibers has lead to values of the cooling speed of the one million C/sec for fibres of 100
micrometers.
Alloys with 1,86 % Ni content in pouring status and ultra-rapid solidificated have been analysed from
the point of crystalline structure.
The paper it’s a short analysis of the use of the X-ray diffraction techniques for observing the effects of
ultra-rapid solidification in Al-Ni alloys. This technique permit to observe highlighting the imperfections
in the crystal pattern.