Microstructure and properties of Al2CrFeCoCuTiNix high-entropy alloys prepared by laser cladding

• Published in: Journal of alloys and compounds Vol. 553; pp. 216 - 220
• Main Authors: Qiu, Xing-Wu, Liu, Chun-Ge
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-03-2013; Elsevier
• Subjects: Al2CrFeCoCuTiNix; Alloys; Applied sciences; Cladding; Coating; Contact of materials. Friction. Wear; Corrosion; Corrosion prevention; Corrosion resistance; Exact sciences and technology; Hardness; High-entropy alloy; Joining, thermal cutting: metallurgical aspects; Killed steels; Laser cladding; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Nickel; Properties; Protective coatings; Wear resistance; Laser cladding; Al2CrFeCoCuTiNix; Microstructure; Properties; High-entropy alloy; high entropy alloy; Scanning electron microscopy; Vickers hardness; FCC lattices; CrFeCoCuTiNi; Aluminium alloy; Al; Phase analysis; Cladding; X ray diffraction; Microhardness; Corrosion resistance; BCC lattices; Wear resistance; Heat affected zone; Nanocrystal
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2012.11.100

► We use a new method (laser cladding) to prepare Al2CrFeCoCuTiNix high-entropy alloys. ► We studied the effect of Ni content on alloys’ properties. ► Alloys show high microhardness, excellent corrosion resistance and wear resistance. ► The laser cladding layers play a good protective effect on Q235 steel.
The Al2CrFeCoCuTiNix high-entropy alloys were prepared by laser cladding. Using metallurgical microscope, scanning electron microscopy with spectroscopy (SEM/EDS), X-ray diffraction, micro/Vickers hardness tester, electrochemical workstation and tribometer the structure and hardness, corrosion resistance and wear resistance of Al2CrFeCoCuTiNix high-entropy alloys were tested. The result shows that, Al2CrFeCoCuTiNix high-entropy alloy samples consist of the cladding zone, bounding zone and heat affected zone. The bounding zone is between cladding layer and the substrate of a good combination; the cladding zone is composed mainly of axis crystal, nanocrystalline and fine white crystals. The Al2CrFeCoCuTiNix high-entropy alloys coating phase structure samples (FCC and BCC structure) due to high-entropy effect. The surface microhardness of Al2CrFeCoCuTiNix high-entropy alloys samples up to 1102 HV, about 4 times as the substrate, and the hardness increases with increasing Ni content. Al2CrFeCoCuTiNix high-entropy alloys coating has good corrosion resistance in 1mol/L NaOH solution and 3.5% NaCl solution. With the increase of Ni content, the corrosion resistance first increases and then decreases. The relative wear resistance of Al2CrFeCoCuTiNix high-entropy alloys coating shows a first increased and then a decreased trend with the increase of Ni content. Both the hardness and ductility are affected by wear resistance. The coating can play a good protective role on substrate Q235 steel.