Influence of Pulsed Current Parameters on the Structure Formation of Amorphous Co-W Alloys and their Thermal Stability
| Authors | V.V. Tytarenko1, , D.V. Gerasimenko2 |
| Affiliations | 1Dnipro University of Technology, 49005Dnipro, Ukraine 2Ukrainian State University of Science and Technologies, 49010Dnipro, Ukraine |
| Е-mail | tytarenko.valentina@gmail.com |
| Issue | Volume 17, Year 2025, Number 3 |
| Dates | Received 10 April 2025; revised manuscript received 15 June 2025; published online 27 June 2025 |
| Citation | V.V. Tytarenko, , D.V. Gerasimenko, J. Nano- Electron. Phys. 17 No 3, 03034 (2025) |
| DOI | https://doi.org/10.21272/jnep.17(3).03034 |
| PACS Number(s) | 64.70.Kb, 68.35.Rh, 68.55. Nq, 68.60.Dv, 81.15.Pq, 81.40.Ef |
| Keywords | Amorphous-crystalline structure, Pulsed electrodeposition modes, Differential thermal analysis, Phase (44) . |
| Annotation | The structure and thermal stability of Co-W alloys electrodeposited with direct and pulsed cur-rents have been investigated by X-ray diffraction and differential thermal analyses. It has been established that amorphization of alloys is influenced by deposition modes and concentration of amorphizing component (sodium tungstate salts) (Na2WO4) in the aqueous electrolyte solution. The studies have shown that the application of pulse electrodeposition mode with pulse repetition frequency 20 Hz and duty cycle 6 allowed to reduce by 27 % the concentration of Na2WO4 required for obtaining Co-W alloys in the X-ray amorphous state.It is shown that with increasing tungsten content in the alloy or under more non-equilibrium conditions of electrodeposition the onset of crystallisation shifts to higher temperatures. During heating of amorphous Co-W alloys, crystallisation starts at temperatures above 740 K with the release of crystalline -Co from the amorphous compo-nent of the phases. At further temperature increase above 850 K, the formation of Co3W phase occurs with simultaneous increase in the fraction of crystalline base metal phase. The final products of the decomposition of amorphous Co-W alloys during heating are a mixture of the equilibrium phases of -Co and Co3W. |
|
List of References English version of article |
Other articles from this number
1) Radiation-Induced Processes in Commercially Available Samples of Activated Carbon Under the Influence of Gamma- and Beta-Radioactivity [0-0]2) Theoretical and Experimental Study of a Human Inner Ear Implant with an Ultrasonic Communication Line [0-0]
3) Thermoresistive Properties of Graphite Films [0-0]
4) Percolation Behavior of Electrical Conductivity of Polylactic Acid-Based Nanocomposites [0-0]
