|
| Abstract No.: |
|
Scheduled at:
|
Friday, May 06, 2022, Hall -2.32/33 3:00 PM
High Entropy Alloys II
|
|
| Title: |
Towards highly durable high entropy alloy coatings using flame spraying
|
|
| Authors: |
Rakesh Bhaskaran Nair* / University of Alberta, Canada
Anthony Kenyi / University of Alberta, Canada
Andre McDonald/ Department of Mechanical Engineering, University of Alberta, 10-230 Donadeo Innovation Center for Engineering,
|
|
| Abstract: |
High entropy alloys (HEAs) constitute a new class of advanced metallic alloys that exhibit exceptional properties due to their unique microstructural characteristics. HEAs contain multiple (five or more) elements in equimolar or nearly equimolar fractions compared to traditional alloy counterparts. Due to their potential benefits, HEAs can be tackled with thermal spray manufacturing technologies that can provide protective coatings for extreme engineering environments. In this study, the AlCoCrFeMoW and AlCoCrFeMoV coatings were successfully developed using flame spraying. The effect of W and V on the HEA coatings were investigated using x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and micro-hardness. Furthermore, the performance evaluation of abrasive damage was investigated as per ASTM G65. Microstructural studies showed different oxides with body-centered cubic (BCC) phases for all the HEA coatings. Hardness results revealed higher for the AlCoCrFeMoV coatings followed by AlCoCrFeMoW and AlCoCrFeMo coatings, respectively. Lower wear rates (213 ×10^(-6) mm^3/Nm were achieved for the AlCoCrFeMoV coatings compared to AlCoCrFeMoW (332 ×10^(-6) mm^3/Nm) and AlCoCrFeMo (549 ×10^(-6) mm^3/Nm) coatings, respectively. The evolution of multiple oxide phases and underlying microstructural features improve the resistance to damage for the AlCoCrFeMoV coatings compared to other HEA coatings. This result suggests that the flame-sprayed HEA coatings can be potential candidates for different tribological interfaces while concurrently opening new avenues for HEAs utilization.
|
|