Size distribution of the shape memory alloys powders obtained by pulsed electrical discharge in cryogenic liquids

  • 1 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine


The relatively simple in implementation the pulsed electrical discharge method as an alternative to the gas atomization was performed for the production of powders of shape memory alloys such as Ti-Ni-based, Ni-Al, Cu-Al-Ni, Ni-Mn-Ga as well as the glass-forming alloy Zr-Ni-Cu-Ti-Al and pure Ti. Several methods have used to analyze the powder size distribution spanning from ordinary sieving and laser diffraction to SEM studying. The most effective SEM method gave the information both for powder sizes distribution and morphology of submicron and micron sized particles. The analysis of SEM images has shown that there are several peculiarities both in the powder size distributions and cumulative distributions. That features reflect the action of several mechanisms of the powder particles formation sized between several micrometers to hundred micrometers. In particularly the powders particles size is in average more in powders obtained in liquid nitrogen than in liquid argon independent on the materials of powder. As well that the number of hollows particles sized between 10 and 50 μm is much more in powders obtained in liquid nitrogen.



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