FeCrNiMnAl high-entropy alloy coating by spray deposition and thermite reaction

Abstract

High-entropy alloy (HEA) coatings demonstrate excellent corrosion resistance and wear resistance. However, their applications are limited owing to a complicated process and high costs. In the present work, an FeCrNiMnAl HEA coating was synthesised by spray deposition combining with thermite reaction using a mixture of Fe 2 O 3 , CrO 3 , MnO 2 , Ni, and Al powders as precursors. After spray deposition, the as-formed coating layer consisted of two bodycentred cubic phases, and showed good metallurgical bonding with the substrate. The average microhardness value of the FeCrNiMnAl HEA coating reached 432.2 ± 10.8 HV, which was higher than that of the substrate (259.5 ± 8.4 HV). The coating also exhibited superior wear resistance and corrosion resistance compared with the substrate. This method has great potential for preparing HEA coatings.

Effect of bias voltages on microstructure and mechanical properties of (AlCrNbSiTi)N high entropy alloy nitride coatings deposited by arc ion plating

“…HEAs have four main effects [7]: the high entropy effect [8,9], the lattice distortion effect [10,11], the sluggish diffusion effect [12], and the cocktail effect [13,14]. They have at least five elements and each element's composition ranges from 5 to 35 at-%.…”

Effect of Al content on microstructure and wear properties of FeCrNiMnAlx high-entropy alloys

“…Owing to the high mixing entropy effect, HEAs intend to form stable solid solutions such as BCC, FCC, or FCC+BCC structure [2][3][4]. Due to the four 'core effects' of high entropy, namely high entropy, sluggish diffusion, severe lattice distortion, and cocktail effects, HEAs exhibit some superior mechanical properties such as high hardness, strength, and ductility [5], exceptional thermal stability [3], excellent oxidation resistance at high temperature, good wear-resistant properties, and corrosion resistance, therefore HEAs become attractive materials for the modern industrial applications [5,6].…”

“…Joseph et al [1] observed the wear rate of Al 0.3 CoCrFeNi remains constant above 600 °C, which was attributed to the strengthening effect of B2 precipitates. Chen et al [5] found that FeCrNiMnAl HEAs coating had a microhardness value of 432.2 HV, which had a lower friction coefficient compared with the substrate by the 0.55 and exhibited superior wear resistance. As less is still known about the wear properties of FeCrNiMnAl series HEAs, the present work aims to study as-cast microstructure, mechanical and wear properties of the FeMnCrNiAl x HEAs changed with Al contents.…”