Processing of AlCoCrFeNiTi high entropy alloy by atmospheric plasma spraying

19th Chemnitz Seminar on Materials Engineering – 19. Werkstofftechnisches Kolloquium

Löbel, M.^1 ; Lindner, T.^1 ; Kohrt, C.^2 ; Lampke, T.^1

Institute of Materials Science and Engineering, Chemnitz University of Technology, Chemnitz

09125, Germany^1

Rhein-Ruhr Beschichtungs-Service GmbH, Rheinberg

47495, Germany^2

关键词: Atmospheric plasma spraying;    Chemical compositions;    Gas-atomized powders;    High mechanical strength;    High temperature resistance;    Particle morphologies;    Thermal spray coatings;    Tribological conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/181/1/012015/pdf
DOI  :  10.1088/1757-899X/181/1/012015

来源: IOP

【 摘 要 】

High Entropy Alloys (HEA) are gaining increasing interest due to their unique combination of properties. Especially the combination of high mechanical strength and hardness with distinct ductility makes them attractive for numerous applications. One interesting alloy system that exhibits excellent properties in bulk state is AlCoCrFeNiTi. A high strength, wear resistance and high-temperature resistance are the necessary requirements for the application in surface engineering. The suitability of blended, mechanically ball milled and inert gas atomized feedstock powders for the development of atmospheric plasma sprayed (APS) coatings is investigated in this study. The ball milled and inert gas atomized powders were characterized regarding their particle morphology, phase composition, chemical composition and powder size distribution. The microstructure and phase composition of the thermal spray coatings produced with different feedstock materials was investigated and compared with the feedstock material. Furthermore, the Vickers hardness (HV) was measured and the wear behavior under different tribological conditions was tested in ball-on-disk, oscillating wear and scratch tests. The results show that all produced feedstock materials and coatings exhibit a multiphase composition. The coatings produced with inert gas atomized feedstock material provide the best wear resistance and the highest degree of homogeneity.