Synthesis and Characterization of High-Entropy Alloy FeCoNiCuCr by Laser Cladding

Abstract

High-entropy alloys have been recently found to have novel microstructures and unique properties. In this study, a novel Al X FeCoNiCuCr high-entropy alloy was prepared by laser cladding. The microstructure, chemical composition, and constituent phases of the synthesized alloy were characterized by SEM, EDS, XRD, and TEM, respectively. High-temperature hardness was also evaluated. Experimental results demonstrate that the Al X FeCoNiCuCr clad layer is composed of only BCC and FCC phases. The clad layers exhibit higher hardness at higher Al atomic content. The AlFeCoNiCuCr clad layer exhibits increased hardness at temperature between 400-700 • C.

Microstructure and Wear Behavior of CoCrFeMnNbNi High-Entropy Alloy Coating by TIG Cladding

“…The excellent properties they showed are the same with the HEAs. However, the HEA cladding coating system is confined to Al x FeCoNiCuCr [11], FeCoNiCrCu [12], TiVCrAlSi [13,14], 6FeNiCoCrAlTiSi [15], NiCrAlCoCu [16], NiCrAlCoMo [16], CoCrCuFeNiNb x [17], and so on.…”

Criteria for Predicting the Formation of Single-Phase High-Entropy Alloys

“…In addition, we predict numerous potential single-phase alloy compositions and provide three tables with the ten most likely five-, six-, and seven-component single-phase alloys to guide experimental searches. The term high-entropy alloy (HEA) has come to signify nontraditional alloy systems composed of five or more elements at, or near, equiatomic ratio that form random, single-phase solid solutions on simple underlying facecentered-cubic (fcc) and body-centered-cubic (bcc) lattices [1][2][3][4][5][6][7][8][9][10][11]. HEAs stand in sharp contrast to traditional metal alloys that are typically based on one or two primary elements and where addition of further alloying elements often leads to the formation of new phases.…”

Effects of Boron Content on Microstructure and Wear Properties of FeCoCrNiBx High-Entropy Alloy Coating by Laser Cladding

“…The alternative laser cladding deposition technique is used to fuse a designed alloy coating with about 1-5 mm thickness on the surface of a low cost iron substrate with a rapid solidification rate (10 4 -10 6 • C/s), which leads to significant effects of non-equilibrium solute trapping, avoiding component segregation and improving solubility of the coating [13,14]. Therefore, significant efforts have been made to investigate the microstructure and mechanical properties of HEA coating by laser cladding [15][16][17][18]. For example, Zhang et al [15] investigated the influences of silicon (Si) (1.2 mol.%), manganese (Mn) (1.2 mol.%), and molybdenum (Mo) (2.8 mol.%) additions on the microstructure, properties, and coating quality of laser-clad FeCoNiCrCu high-entropy alloy coating and found that the FeCoNiCrCu coatings with or without Si, Mn, and Mo additions are both identified to be simple FCC solid solutions.…”

“…Besides, the micro-hardness is much higher than that of the alloy prepared by the arc melting technique with the same composition. Ye et al [16] studied the microstructure of the laser cladding Al x FeCoNiCuCr coating, the effects of aluminum (Al) element content on the coating hardness, and the high-temperature micro-hardness of the coating. Chuang et al [17] reported that the strengthening methods for HEA coating can be performed through substitutional solid solution strengthening, by the addition of elements with large atomic radii, such as Al and titanium (Ti), to induce high lattice distortion.…”