Author: Prof. Dr. ing. Lidia CRISTEA, Prof. Dr. Eufrosina OTLACAN, Drd. ing. Enona CRISTEA
Publishing Date: 2007
Volume 22 Issue 1-2
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.