Wear and corrosion properties of B4C-added CoCrNiMo high-entropy alloy coatings with in-situ coherent ceramic

Microstructure and mechanical properties of WB2–B4C composites fabricated by boro/carbothermal reduction and SPS

“…The two marked lattice planes were not parallel and cannot form a coherent interface. However, lattice distortion regions could be observed at the interfaces, which form the transition regions between WB 2 and B 4 C grains, coordinating the arrangement of atoms at the interface during the sintering process 47,48 . As shown in Figure 5E, the interplanar distance of the grain on the left was 2.220 Å, which corresponds to the (1 1 3) plane of B 4 C. The interplanar distance of the grain on the right was 1.858 Å, which corresponds to the (1 0 5) plane of WB 2 .…”

“…However, lattice distortion regions could be observed at the interfaces, which form the transition regions between WB 2 and B 4 C grains, coordinating the arrangement of atoms at the interface during the sintering process. 47,48 As shown in Figure 5E, the interplanar distance of the grain on the left was 2.220 Å, which corresponds to the (1 1 3) plane of B 4 C. The interplanar distance of the grain on the right was 1.858 Å, which corresponds to the (1 0 5) plane of WB 2 . WB 2 and B 4 C crystal planes satisfy the parallel relationship: (1 1 3) B 4 C // (1 0 5) WB 2 , and the degree of mismatch between crystal plane (1 1 3) B 4 C and crystal plane (1 0 5) WB 2 is 16.3%, which forms a semi-coherent interface and helps to reduce the interface energy, resulting in a higher interfacial bonding strength.…”

Wear‐Resistance of High‐Entropy Alloy Coatings and High‐Entropy Alloy‐Based Composite Coatings Prepared by the Laser Cladding Technology: A Review

“…The reason for this choice is the excellent high-temperature resistance, wear resistance, and corrosion resistance of ceramics. Common additive ceramic phases were TiC, [64][65][66] B 4 C, [67,68] WC, [69][70][71] NbC, [72,73] etc. After the addition of the ceramics, the hardness of the coating became significantly increased as compared with the original HEA coating.…”

“…The addition of nonmetallic ceramic phases could also improve the wear‐resistance of the HEA‐LC coatings. Di et al [ 68 ] added different amounts of nonmetallic ceramic B 4 C phases (1%, 2%, 3%, and 4.2 wt%) to CoCrNiMo. The hardness, COF, wear volume, and wear profile of the resulting coatings are shown in Figure a–d.…”

“…Figure 9. a) Microhardness along the depth of the coatings, b) COF, c) wear sectional profiles,and d) wear volume losses. Reproduced with permission [68]. Copyright 2021,Elsevier.…”