Effects of W Alloying on the Lattice Distortion and Wear Behavior of Laser Cladding AlCoCrFeNiWx High-Entropy Alloy Coatings

Abstract

Friction and wear properties of hot working die steel at above 800 °C are of particular interest for high temperature applications. Here, novel AlCoCrFeNiWx high-entropy alloy (HEA) coatings have been fabricated on the surface of hot working die steel by laser cladding. The effects of the as-prepared AlCoCrFeNiWx HEA coatings on the microstructure and high temperature friction and wear behavior of hot working die steel are investigated through scanning electron microscopy (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD), and X-ray absorption fine structure (XAFS). Having benefited from the formation of W-rich intermetallic compounds after the addition of W elements, the high temperature wear resistance of the coatings is obviously improved, and friction coefficient shows a large fluctuation. The microstructural characteristics of the AlCoCrFeNiWx HEA coatings after the high temperature wear resistance test shows a highly favorable impact on microstructure stability and wear resistance, due to its the strong lattice distortion effect of W element on BCC solid solutions and the second phase strengthening of the W-rich intermetallic compounds. These findings may provide a method to design the high temperature wear resistant coatings.

Optimization strategies of high-entropy alloys for electrocatalytic applications

“…Wu et al verified the lattice distortion of AlCoCrFeNiW HEA by XAFS analysis. 59 As shown in Fig. 3e, the spectral positions of all elements in AlCoCrFeNiW HEA deviate from the standard sample, indicating that there is a huge lattice distortion.…”

“…(e) Fourier transform spectra of XAFS K-edges in AlCoCrFeNiW x . Reproduced with permission 59. Copyright 2021, MDPI.…”

Crack Inhibition and Performance Modification of NiCoCr-Based Superalloy with Y2O3 Nanoparticles by Laser Metal Deposition

“…As provided in Table 1 , the matrix including Ni, Co, and Cr exhibits good thermal resistances and mechanical behavior under high temperature with the addition of Al, Ti, and Nb, which are used as solution-strengthening elements [ 15 , 16 ]. W is also added to enhance wear resistance and generate strengthening effects by causing lattice distortion because of its largest atomic radius [ 17 ]. The powder was prepared by the argon blowing method, and their particle sizes were measured to be approximately 50 μm~75 μm.…”

Effects of WC on the Microstructure, Wear and Corrosion Resistance of Laser-Deposited CoCrFeNi High Entropy Alloy Coatings

“…High entropy alloy (HEA) is gaining significant attention in the engineering coatings industry because of its outstanding strength and hardness, wear and corrosion resistance, and resistance to high temperature softening [9,10]. In recent years, laser cladding has been used to coat steel surfaces with HEA to improve wear resistance and corrosion resistance [11][12][13][14][15]. Different elements perform different functions in HEA [16].…”