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5287 |
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Wednesday, June 07, 2017, Hall Y 3:55 PM Session Young Professionals |
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Development of wear-resistant high-entropy alloy coatings produced by
thermal spray technology
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Martin Löbel* / Chemnitz University of Technology, Germany Thomas Lindner/ TU Chemnitz, Institut für Werkstoffwissenschaft und Werkstofftechnik, Germany Christof Kohrt/ Rhein-Ruhr Beschichtungs-Service, Germany Thomas Uhlig/ TU Chemnitz, Institut für Werkstoffwissenschaft und Werkstofftechnik, Germany Thomas Lampke/ TU Chemnitz, Institut für Werkstoffwissenschaft und Werkstofftechnik, Germany |
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The alloying concept of High-Entropy Alloys (HEA) has attracted much scientific interest due to an interesting combination of properties. Previous investigations have shown that high hardness and strength, comparable to bulk metallic glasses, can be achieved. Furthermore, HEAs show distinct ductility and good high-temperature resistance. Tribological properties have been investigated indicating high wear resistance of HEAs. The focus of this contribution is on further studying the tribological properties and transferring bulk properties to thermally sprayed coatings to enlarge the field of possible applications. Therefore, the alloy AlCoCrFeNiTi with equimolar composition was produced by inert gas arc melting. Tribological properties of the bulk samples under different wear regimes were investigated in Ball-on-disk wear test, oscillating wear test and scratch test. Powder preparation for thermal spray process was carried out by inert gas atomization. Subsequently, coatings were deposited by Atmospheric Plasma Spray (APS) and High-Velocity Oxy Fuel (HVOF) thermal spray. According to bulk samples, tribological properties of the coatings were analyzed and correlated with microstructure and hardness. |