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Understanding Grain Growth and Pore Elimination in Vacuum-Plasma-Sprayed Titanium Alloy

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In the present study, grain growth, pore elimination, and densification of the vacuum-plasma-sprayed structure of Ti-6Al-4V alloy were investigated. The near-net-shaped formed components were deposited using a vacuum plasma spraying process. The as-sprayed specimens were heat treated at 1040 °C (50 °C above the β transus temperature) for up to 1440 minutes in an inert gas atmosphere. The apparent density of the as-sprayed and heat-treated samples was determined by the water displacement method. The theoretical density of the heat-treated samples was calculated from lattice parameters and phase compositions determined using X-ray diffraction (XRD). Densification of the heat-treated specimens at a given temperature and time was determined. Results revealed that the density initially increased sharply with isothermal heat treatment time and then reached a plateau. During short heat treatment times, the grains grow quickly within individual splats at a rate consistent with intrinsic boundary mobilities. For longer heat treatment times, the grain boundary mobility was limited by pore drag, and the grain growth rate was reduced. The pore and grain sizes increased with increasing isothermal heat treatment time up to about 17 and 100 μm, respectively.

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Authors and Affiliations

  1. Center for Advanced Coating Technologies, University of Toronto, M5S 3G8, Toronto, Canada

    H. R. Salimi Jazi (Postdoctoral Student), T. W. Coyle (Professor of Materials Science and Engineering) & J. Mostaghimi (Professor of Mechanical, Industrial Engineering)

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  1. H. R. Salimi Jazi
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  2. T. W. Coyle
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  3. J. Mostaghimi
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Correspondence to H. R. Salimi Jazi.

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Manuscript submitted June 8, 2006.

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Jazi, H.R.S., Coyle, T.W. & Mostaghimi, J. Understanding Grain Growth and Pore Elimination in Vacuum-Plasma-Sprayed Titanium Alloy. Metall Mater Trans A 38, 476–484 (2007). https://doi.org/10.1007/s11661-006-9075-4

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  • DOI: https://doi.org/10.1007/s11661-006-9075-4

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