A mechanistic perspective on the kinetics of plastic deformation in FCC High Entropy Alloys: Effect of strain, strain rate and temperature

Computational and Experimental Investigation of the Strain Rate Sensitivity of Small Punch Testing of the High-Entropy Alloy Cocrfemnni

“…For example, Park et al [13] performed quasi-static compression tests on CoCrFeMnNi HEA (Cantor alloy) at strain rates from 10 −4 s −1 (0.024 mm•min −1 ) to 10 −2 s −1 (2.4 mm•min −1 ) and obtained a strain-rate sensitivity exponent (m) of 0.028, while for dynamic compression tests at strain rates of ∼ 3000, ∼3500, and ∼4700 s −1 , much higher values were obtained, although a number was not given [13]. In fact, the CoCrFeMnNi alloy is the HEA that exhibits highest strain hardening rate compared to other HEAs in dynamic conditions [14], a behaviour similar to that of FCC solid solutions at the conditions of temperature and strain rate studied to date [15]. This behaviour is attributed to the fact that for the quasi-static deformations, rate-controlled dislocation motion is governed by the thermally activated process.…”

Microstructures, Oxidation, and Mechanical Properties of an FCC HEA

“…The theory of strengthening FCC HEAs has been explained using a Ni-Co-Fe-Cr-Mn FCC HEA by Varenne et al [20] and results presented by Quin [21] indicate strengthening by Mo addition in Co-Cr-Fe-Mn-Ni FCC HEAs, in particular. Strain, strain rate, and temperature effects of Co-Cr-Fe-Mn-Ni FCC HEAs have been studied by Raturi [22].…”

High Entropy Cantor Alloys (HEAs) modification induced by tungsten alligation, heat treatment and deep cold plastic deformation

“…The combination of these parameters highly influences possible obtainable microstructure (disordered or ordered solid solution, mono or polyphasic microstructures…) and then the properties of the material. HEAs offer an excellent combination of strength, strain hardening ability, good plasticity, ductility and fracture toughness especially at cryogenic temperatures better than the existing conventional metals and alloys [6]. The majority of reported HEAs compositions are based on the transition metals, namely Co, Cr, Fe and Ni, with addition of elements like Al, Cu, Mn, V, Ti, and Mo [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

“…HEAs offer an excellent combination of strength, strain hardening ability, good plasticity, ductility and fracture toughness especially at cryogenic temperatures better than the existing conventional metals and alloys [6]. The majority of reported HEAs compositions are based on the transition metals, namely Co, Cr, Fe and Ni, with addition of elements like Al, Cu, Mn, V, Ti, and Mo [1][2][3][4][5][6][7][8][9][10][11][12][13]. Several combinations of these elements can develop high entropy alloys characterized by simple monophasic structures (usually face centred cubic crystals) and very promising mechanical properties (high strength and high ductility).…”