Strengthening the CoCrFeNiNb0.25 high entropy alloy by FCC precipitate

High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments

“…Precipitation hardening represents an effective strengthening mechanism, as reported for the Al─Co─Cr─Cu─Fe─Ni [10,11] and Al─Cr─Fe─Mn─Ni [12] multicomponent systems. Further introduction of ordered nano-precipitates as pinning centres [13] can be achieved by selective annealing [14,15] or by the addition of alloying elements [16]. These intermetallics require stabilization to maintain coherence without disrupting the matrix [17,18].…”

Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures

“…By adding Al element into the CoCrFeNi base, Ma et al obtained fcc single crystals of CoCrFeNiAl0.3 HEA with an ultimate tensile elongation of 80% [26]. Moreover, elements with larger atomic size were also used to strengthen the CoCrFeNi base and many new alloys were designed, such as CoCrFeNiNbx [22][23][24], CoCrFeNiTix [21] and CoCrFeNiMox [7]. These CoCrFeNi based HEAs are potential candidates to be applied in different environments.…”

Effect of deep cryogenic treatment on the microstructure and mechanical properties of AlCrFe2Ni2 High-entropy alloy

“…High-entropy alloys (HEAs) were introduced in the 1990s [1,2] and overcame the limitations of traditional alloys and became popular due to their simple phase structure [3][4][5][6][7][8][9] and excellent mechanical properties [10][11][12][13][14][15][16]. Heat treatment of traditional as-cast alloys can eliminate internal structural defects and stresses and improve their properties [17][18][19][20][21][22]. Deep cryogenic treatment is a type of heat treatment that is widely used to study traditional alloys.…”