Annealing behavior of AlCoCrFeNiTi0.5 high entropy alloy coatings prepared by laser cladding was investigated. The specimens were annealed at 900 °C for 5 h. The microstructure and wear resistance of the as-annealed and as-cast specimens were investigated. The XRD results indicate that the as-annealed AlCoCrFeNiTi0.5 high entropy alloy coating is composed of Al80Cr13Co7, Co3Ti, and AlFe solid solution phase. The SEM results and EDS data show that a typical spinodal decomposition structure with uniform composition is formed after annealing treatment. The average Vickers micro-hardness of the as-annealed coatings could reach 9890 MPa which is increased by about 73.5% compared with that of the as-cast coatings. The abrasion resistance testing shows that the abrasion loss of the as-annealed coatings is reduced by 92.5% and the wear width is reduced by 50% compared with the values of as-cast coatings.
High-entropy AlxCoCrFe2.7MoNi (x = 0, 0.5, 1.0, 1.5, 2.0) alloy coatings were prepared on pure iron by laser cladding. The effects of Al content on the microstructure, hardness, wear resistance and corrosion resistance of the coatings were studied. The results showed that the crystal phases of the AlxCoCrFe2.7MoNi coatings changed from Mo-rich BCC1 + FCC to (Al, Ni)-rich BCC2 + Mo-rich BCC1 when x increased from 0 to 0.5, and the phase changed to an (Al, Ni)-rich BCC2 + (Mo, Cr)-rich σ phase as x increased further. The hardness of the coatings increased as the Al content increased. The Al2.0CoCrFe2.7MoNi coating exhibit best wear resistance. Addition of Al increased the corrosion potential in a 3.5 wt.% NaCl solution, and the coating with x = 1.0 exhibited the highest corrosion resistance.
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