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2047 |
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Wednesday, May 05, 2010, Olivia Room 11:00 AM Properties 2 |
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Characterization of mechanical properties of titanium cold spray coatings |
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Dina Goldbaum* / McGill University, Canada Richard Chromik / McGill University/ Department of Mining and Materials Engineering, Canada Jihane Ajaja/ McGill University/ Department of Mining and Materials Engineering, Canada Ahmad Rezaeian/ McGill University/ Department of Mining and Materials Engineering, Canada Wilson Wong/ McGill University/ Department of Mining and Materials Engineering, Canada Stephen Yue/ McGill University/ Department of Mining and Materials Engineering, Canada Eric Irissou/ National Research Council Canada(NRC) ? Industrial Materials Institute(IMI), , Canada Jean Gabriel Legoux/ National Research Council Canada(NRC) ? Industrial Materials Institute(IMI), , Canada |
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Vickers hardness testing is one of the most common techniques used today to test the mechanical properties of coatings as well as bulk materials. While the mechanical properties of the bulk materials can be well defined using this technique, a number of parameters are of concern when evaluating the mechanical properties of coatings. Indentation loads, coating porosity, particle bonding strength, and microstructure and sample contamination can affect the mechanical properties measurements. The present study explores a method for mechanical property comparison of coatings to the bulk materials. The method is based on evaluation in the degree of indentation size effect, evaluated by the Meyers Law, for cold sprayed Ti coatings and bulk Ti. Hardness was measured by both nanoindentation and Vickers testing over a load range of 10-3 N to 5 N. The hardness and reduced modulus of commercially pure titanium coatings, deposited at increasing deposition velocity conditions are compared with the properties of commercially pure bulk titanium plate through indentation testing. Cold sprayed Ti coatings deposited at higher deposition velocity are shown to have a similar indentation response and properties to those of a bulk Ti. |