Al0.25CoCrFeNiSi0.6 high entropy alloy with high hardness and improved wear resistance

A review on wear, corrosion, and wear-corrosion synergy of high entropy alloys

“…Aluminium is considered as the most studied element in HEAs [ [27] , [28] , [29] , [30] , [31] , [32] , [33] ]. The wear behaviour of Al x CrFeCoNiCu ( x = 0.5, 1.0, 1.5, 2.0 in molar ratio) HEAs was investigated by modifying their aluminium content [ 27 ].…”

“…When adding 0.25 mole of Al and 0.6 mole of Si to the CrFeCoNi system, the microstructure of the resulting Al 0.25 CoCrFeNiSi 0.6 HEA consists of a mixture of FCC + BCC solid solution phases and needle-shape Cr 3 Si intermetallic phase responsible for the increase of microhardness (710 HV) and the decrease of wear rate (3.1 × 10 −5 mm 3 N −1 m −1 ) [ 31 ]. Therefore, this HEA is considered as a promising wear resistant material having low aluminium content.…”

Corrosion Resistance of Al0.5CoCrFeNiCuxAgy (x = 0.25, 0.5; y = 0, 0.1) High-Entropy Alloys in 0.5M H2SO4 Solution

“…The concept of high-entropy alloys (HEAs), proposed in 2004 by Cantor and Yeh [1,2], has attracted significant scientific interest owing to their unique properties such as high strength and ductility [3,4], good fatigue resistance [5,6], and improved tribological characteristics [7][8][9]. Considering the relatively large number of materials working under extreme conditions, the behavior of HEAs at both ultralow [10][11][12] and elevated temperatures [13][14][15], as well as their corrosion resistance in various aggressive solutions [16,17], have been also investigated.…”

A Study on Outstanding High‐Temperature Wear Resistance of High‐Entropy Alloys

“…Adding Al, [53][54][55][56] Cu, [20,57] Ti, [58] Nb, [59][60][61] TiB 2 , [62] graphene nanoplatelets, [63] micrographite and nanographene particles, [64] Co, [65,66] nitriding, [67] Pb and Bi, [68,69] Mo, [70,71] V, [72] Si, [56] Fe, [16] Zr, [33] and Ag [73] led to an improved tribological and mechanical performance at low and high temperature, while addition of Si [74] beyond a critical value led to an increased wear rate due to the reduction of compressive strength and fracture toughness. The wear resistance of Al0.25CoCrFeNiSi0.6 HEA with respect to the presence of Si was investigated by Olga et al [75] The microstructure of HEA was composed of two phases, high-entropy solid-solution matrix-holding FCC crystal structure and low-entropy Cr 3 Si intermetallic compound with BCC structure as the strengthening particle. The high hardness of the presented alloy was correlated to the formation of Cr3Si (710 AE 25 HV0.3).…”