The Study of the Crystalline Structure of the Phases in the Al-Ni Alloys Ultra Rapid Solidification

Melt-spinning and melt-extraction methods of rapid solidification have been applied on Al-Ni alloys in the lower and higher composition. For guiding appreciations of the peripheral speed of the cooling disk it is used the dependence between the thickness of the solidified fibbers and the peripheral speed of the extraction disk. The cooling speed calculated on the basis of the thermo transfer coefficient in accordance with the thickness of the fibers has lead to values of the cooling speed of one million C/sec (fibers of 100 micro meters). Alloys with 1, 86% Ni content in pouring status and ultra rapid solidified have been analyzed from the point of crystalline structure. The paper is 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 permits to observe highlighting the imperfections in the crystal pattern.