Effect of microarc oxidation coating on fatigue performance of Ti–Al–Zr alloy

Ceramic coatings of different thickness were fabricated on Ti6Al2Zr1Mo1V alloy by microarc oxidation (MAO), and the effect of the coating on fatigue life was evaluated by 810 Material Test System. The microstructure, phase and chemical composition of the coatings were determined by SEM, XRD and EDS...

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Veröffentlicht in:Applied surface science 2009-07, Vol.255 (20), p.8616-8623
Hauptverfasser: Wang, Y.M., Zhang, P.F., Guo, L.X., Ouyang, J.H., Zhou, Y., Jia, D.C.
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container_end_page 8623
container_issue 20
container_start_page 8616
container_title Applied surface science
container_volume 255
creator Wang, Y.M.
Zhang, P.F.
Guo, L.X.
Ouyang, J.H.
Zhou, Y.
Jia, D.C.
description Ceramic coatings of different thickness were fabricated on Ti6Al2Zr1Mo1V alloy by microarc oxidation (MAO), and the effect of the coating on fatigue life was evaluated by 810 Material Test System. The microstructure, phase and chemical composition of the coatings were determined by SEM, XRD and EDS techniques. The coating mainly consists of rutile and a small amount of anatase TiO 2. With oxidation time ranging from 10 to 30 min, the coating thickness increases from 13 to 25 μm, while the interface between coating and substrate becomes more zigzag, characterized by increasing overgrowth regions of coating into substrate. Under the same cyclic stress of 750 MPa, the fatigue life decreases from 2.08 × 10 6 cycles for uncoated specimen to about 3 × 10 4 cycles for microarc oxidized specimen. Under the cyclic stress, the thicker the coating, the more cracks initiate in the overgrowth regions of coating into substrate near the interface, which are considered as the notch sites of stress concentration to induce the crack initiation, also is the key factor to cause the facture.
doi_str_mv 10.1016/j.apsusc.2009.06.038
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subjects Coatings
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue properties
Microarc oxidation (MAO)
Physics
Ti–Al–Zr alloy
title Effect of microarc oxidation coating on fatigue performance of Ti–Al–Zr alloy
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