Liquidus projection of the Al–Nb–V system. (December 2020)

• Record Type: Journal Article
• Authors: Santos, J.C.P.; Chaia, N.; Borowski, K.E.; da Silva, A.A.A.P.; Barros, D.F.; Abreu, D.A.; Nunes, C.A.; Coelho, G.C.
• Is Part Of: Calphad. Volume 71(2020)
• Publication Date: 2020-12
• Subjects: Liquidus projection -- Al–Nb–V system -- Refractory high-entropy alloys -- As-cast microstructures -- Phase diagram; Phase diagrams -- Data processing -- Periodicals; Thermochemistry -- Data processing -- Periodicals; Diagrammes de phases -- Informatique -- Périodiques; Thermochimie -- Informatique -- Périodiques; Thermodynamica; Electronic journals; 541.363
• DOI: 10.1016/j.calphad.2020.102196
• Languages: English
• ISSNs: 0364-5916

Abstract

Abstract: In the present work, the liquidus projection of the Al–Nb–V system is proposed for the first time. It corresponds to important data for the design of innovative low-density Al-containing refractory high-entropy alloys. Experimental investigation was carried out via microstructural characterization of fifty-six alloys in as-cast state using scanning electron microscopy (SEM), electron dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). Results showed no signs of ternary phases and only primary precipitation fields from binary phases were observed. The BCC primary precipitation field is dominant, while V5 Al8 primary precipitation field is restricted to a small region close to Al–V binary. Three class II (UI, UII and UIII ) ternary invariant reactions were proposed. Highlights: The liquidus projection of the Al–Nb–V system was experimentally determined for the first time. Investigation did not find signs of ternary phases and only primary precipitation fields from binary phases were observed. The BCC primary precipitation field is preponderant in the diagram. Three class II ternary invariant reactions were proposed.