The role of the preparation route on microstructure and mechanical properties of AlCoCrFeNi high entropy alloy

0585792 - FZÚ 2025 RIV NL eng J - Journal Article
Kratochvíl, P. - Průša, F. - Thürlová, H. - Strakošová, A. - Karlík, M. - Čech, J. - Haušild, P. - Čapek, J. - Ekrt, Ondřej - Jarošová, Markéta - Vronka, Marek - Veselý, J. - Minárik, P. - Jankovský, O. - Cabibbo, M.
The role of the preparation route on microstructure and mechanical properties of AlCoCrFeNi high entropy alloy.
Journal of Materials Research and Technology-JMR&T. Roč. 30, May (2024), s. 4248-4260. ISSN 2238-7854. E-ISSN 2214-0697
Institutional support: RVO:68378271
Keywords : AlCoCrFeNi high entropy alloy * microstructure * mechanical properties
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.4, year: 2022
Method of publishing: Open access

Nearly equiatomic AlCoCrFeNi alloy samples were prepared by induction melting and mechanical alloying (MA) combined with spark plasma sintering (SPS). The cast sample showed a dendritic microstructure composed of spinodally decomposed nanometric constituents of the B2 and BCC phases. The spark plasma sintered sample exhibited an ultrafine-grained microstructure of B2 phase and FCC solid solution and Cr23C6 carbides. The MA + SPS sample was strengthened by compressive stress-strain test up to a yield strength of 2029 ± 5 MPa, resulting significantly higher compared to 1366 ± 32 MPa of the cast sample. In addition to the higher compressive yield strength, the sintered sample exhibited a hardness of more than 130 HV higher compared to the cast alloy. On the other hand, the cast alloy showed high plastic deformation (29%) and significantly high ultimate compressive strength of 3072 ± 122 MPa.
Permanent Link: https://hdl.handle.net/11104/0353470