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https://hdl.handle.net/2440/117458
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Type: | Journal article |
Title: | Enhancing the cavitation erosion resistance of D8m-Ta5Si3 nanocrystalline coatings through Al alloying |
Other Titles: | Enhancing the cavitation erosion resistance of D8(m)-Ta(5)Si(3) nanocrystalline coatings through Al alloying |
Author: | Xu, J. Liu, W. Jiang, S. Munroe, P. Xie, Z. |
Citation: | Ultrasonics Sonochemistry, 2019; 50:138-156 |
Publisher: | Elsevier |
Issue Date: | 2019 |
ISSN: | 1350-4177 1873-2828 |
Statement of Responsibility: | Jiang Xu, Wei Liu, Shuyun Jiang, Paul Munroe, Zong-Han Xie |
Abstract: | To investigate the effects of Al alloying on the erosion-corrosion resistance of β-Ta5Si3, both a β-Ta5Si3 coating and an Al-alloyed β-Ta5(Si0.83Al0.17)3 coating were synthesized on a 316 substrate by the double cathode glow discharge technique. The phase constitution, composition and microstructure of the two coatings were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The two coatings were composed of nearly rounded D8m-β-Ta5Si3 grains with an average size of ∼4 nm, and after the addition of Al, the preferred growth orientation for the β-Ta5Si3 coating changed from (4 0 0) to (0 0 2). The hardness, elastic modulus and contact damage resistance of the coatings were measured using a nanoindentation tester. The results showed that Al alloying improved the contact damage resistance of β-Ta5Si3 with only a slight decrease in hardness. The erosion-corrosion behavior of the two coatings was performed in a 3.5 wt% NaCl solution containing a 12 wt% concentration of silica sand under two phase slurry flow condition and in a 3.5 wt% NaCl solution under ultrasonic cavitation erosion conditions. This revealed that the Al alloyed β-Ta5Si3 has a higher resistance to both erosion-corrosion and ultrasonic cavitation erosion as compared to the binary β-Ta5Si3 coating. |
Keywords: | Refractory metal silicides; erosion-corrosion; ultrasonic cavitation erosion; potentiodynamic polarization; EIS |
Rights: | © 2018 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.ultsonch.2018.09.008 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1016/j.ultsonch.2018.09.008 |
Appears in Collections: | Aurora harvest 3 Mechanical Engineering publications |
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