Design of a new cobalt base nano-lamellar eutectic high entropy alloy. (September 2021)

• Record Type: Journal Article
• Authors: Vikram, R.J.; Gupta, Kushagra; Suwas, Satyam
• Is Part Of: Scripta materialia. Number 202(2021)
• Publication Date: 2021-09
• Subjects: High temperature alloy -- High entropy alloy -- Electron probe microanalysis (EPMA) -- Texture -- CALPHAD; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113993
• Languages: English
• ISSNs: 1359-6462

Abstract

Highlights: A new nano lamellar eutectic cobalt-base high entropy alloy (EHEA) was developed. The alloy was designed based on analytical consideration and Thermocalc calculation. The alloy exhibited superior mechanical properties than Ni based EHEAs. Abstract: Inspired by the outstanding properties of cobalt-base superalloys, an effort has been made to develop cobalt-base high entropy alloy for high temperature applications based on valance electron concentration (VEC). The newly developed cobalt-base high entropy alloy exhibited a two-phase microstructure with nano lamellar eutectic morphology. The constituent phases were identified as face centered cubic (FCC) and ordered cubic (B2) structure, which were validated through CAlculation of PHAse Diagram (CALPHAD). The newly developed HEA exhibited remarkable strain hardening behavior at room temperature as well as thermal stability in the temperature range 500–800 °C. Graphical abstract: Image, graphical abstract