Manufacturing of high entropy alloy in the Ni-Nb-Co-Fe-Cr system by rapidly solidification method for oxide ceramic brazing

• Published in: IOP conference series. Materials Science and Engineering Vol. 1005; no. 1; pp. 12012 - 12019
• Main Authors: Gabov, A I, Ivannikov, A A, Sevryukov, O N
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.12.2020
• Subjects: Alloys; Aluminum; Aluminum oxide; Brazed joints; Brazing alloys; Ceramics; Chromium; Cobalt; Differential thermal analysis; Entropy; Filler metals; High entropy alloys; Iron; Liquidus; Microhardness; Nickel; Niobium; Phase composition; Rapid quenching (metallurgy); Solidification; Solidus
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/1005/1/012012

This paper presents results of research of high-entropy alloys of the Ni-Nb-Co-Fe-Cr system in the as-cast state and after rapid quenching from the melt. The results of experiments on obtaining a brazed joint of aluminum-oxide ceramics with using the filler metal of this system and the results of a studying this joint are presented. Differential thermal analysis (DTA), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray microanalysis (EDX) and measurement of microhardness were used as experimental research methods. The liquidus and solidus temperatures of high-entropy alloy Nb0.73CoCrFeNi2.1 were determined. The phase composition of alloys of the Ni-Nb-Co-Fe-Cr system was studied. It was shown, that alloys of this system can be used as filler metal to create a joint between ceramics. The microhardness of the brazed seam was studied. Based on these results the brazing mode for samples of aluminum-oxide ceramics with using high-entropy alloy Nb0.73CoCrFeNi2.1 as a filler metal was chosen.