Cooling rate control combined with refractory Mo and/or V addition to enhance the mechanical properties of CoCrFeMnNi alloy Articles uri icon

authors

  • GONZALEZ SANCHEZ, SERGIO
  • GARAY REYES, C. G.
  • MARTINEZ GARCIA, A.
  • GOKULDOSS PRASHANTH, KONDA
  • RUIZ ESPARZA RODRIGUEZ, M. A.
  • HURTADO MACIAS, A.
  • ECKERT, J.
  • MARTINEZ SANCHEZ, R.

publication date

  • May 2025

start page

  • 459

end page

  • 469

volume

  • 36

International Standard Serial Number (ISSN)

  • 2238-7854

Electronic International Standard Serial Number (EISSN)

  • 2214-0697

abstract

  • This work shows that optimum combination of cooling rate control and refractory Mo and/or V element addition to the CoCrFeMnNi (Cantor) HEA enables to develop novel high-strength hierarchical microstructures consisting of FCC, o phase and finely dispersed precipitates. This has been achieved by casting CoCrFeMnNiV0.5, CoCrFeMnNiMo0.5 and CoCrFeMnNiV0.5Mo0.5 at. % HEAs at a cooling rate of 1000K/s. Since this cooling rate is relatively fast, it enables to retain the Mo and/or V alloying elements in solid solution in the FCC phase. The phenomenon of solid solution hardening contributes to a decrease in the maximum indentation depth from 100um for CoCrFeMnNi, to 89um and 85um for the FCC and o phases, respectively in the CoCrFeMnNiV0.5Mo0.5 at. % HEA. The novel microstructures additionally improve the wear resistance, particularly regarding the scratch hardness number, from Hs=2.74GPa for CoCrFeMnNi, to 4.19GPa for CoCrFeMnNiV0.5, 4.78GPa for CoCrFeMnNiMo0.5 and 6.85GPa for CoCrFeMnNiMo0.5V0.5 thus making these alloys of potential interest for engineering components subjected to load and wear.

subjects

  • Materials science and engineering

keywords

  • electron microscopy; x-ray analysis; other metallic alloys; casting methods; grains and interfaces