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dc.contributor.authorLek, Jun Yanen_US
dc.contributor.authorBhowmik, Ayanen_US
dc.contributor.authorTan, Adrian Wei-Yeeen_US
dc.contributor.authorSun, Wenen_US
dc.contributor.authorSong, Xuen_US
dc.contributor.authorZhai, Weien_US
dc.contributor.authorBuenconsejo, Pio Johnen_US
dc.contributor.authorLi, Fengen_US
dc.contributor.authorLiu, Erjiaen_US
dc.contributor.authorLam, Yeng Mingen_US
dc.contributor.authorBoothroyd, Chris B.en_US
dc.identifier.citationLek, J. Y., Bhowmik, A., Tan, A. W.-Y., Sun, W., Song, X., Zhai, W., . . . Boothroyd, C. B. (2018). Understanding the microstructural evolution of cold sprayed Ti-6Al-4V coatings on Ti-6Al-4V substrates. Applied Surface Science, 459, 492-504. doi:10.1016/j.apsusc.2018.07.175en_US
dc.description.abstractRapid development of cold spray technology has made it a viable option to remanufacture and repair damaged engineering components made of Ti-6Al-4V (Ti64). This solid-state deposition process contributes to the distinctive microstructure of Ti64 coatings. In this study, the microstructural evolution of Ti64 from feedstock powder to coating as a result of high strain rate deformation is evaluated. TEM lamellae were extracted from the particle-substrate and particle-particle interfaces of a cold sprayed coating by focused ion beam milling and a comprehensive microstructural analysis was carried out. The feedstock powder is predominantly composed of martensitic lathes. The microstructure of the coating at the particle-substrate interface is noticeably different from the microstructure of the feedstock powder. Narrow regions consisting of nanometre-sized grains are observed in both the particle and substrate in the vicinity of the interface. Adiabatic shear instability under localized high strain rate deformation and heat accumulation are believed to be responsible for this observation. However, the martensitic structure is partially retained in the less deformed region of the particles, further away from the interfaces. The formation mechanism of the microstructure observed from the inner region of particle, at the vicinity of the particle-substrate and particle-particle interfaces respectively is discussed in the light of microstructural observations and finite element modelling.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.relation.ispartofApplied Surface Scienceen_US
dc.rights© 2018 Elsevier B.V. All rights reserved. This paper was published in Applied Surface Science and is made available with permission of Elsevier B.V.en_US
dc.titleUnderstanding the microstructural evolution of cold sprayed Ti-6Al-4V coatings on Ti-6Al-4V substratesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science & Engineeringen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.organizationRolls-Royce@NTU Corporate Laben_US
dc.contributor.researchFacility for Analysis, Characterisation, Testing and Simulationen_US
dc.contributor.researchSingapore Institute of Manufacturing Technologyen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsKinetic Sprayingen_US
dc.subject.keywordsTi-6Al-4V Coatingen_US
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