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		<doi>10.1016/j.apsusc.2014.05.047</doi>
		<label>scopus 2014-11 OliveiraOlivReisCarr:2014:EfNiHi</label>
		<issn>0169-4332</issn>
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		<citationkey>OliveiraOlivReisCarr:2014:EfNiHi</citationkey>
		<author>Oliveira, Aline Capella de,</author>
		<author>Oliveira, Rogerio de Moraes,</author>
		<author>Reis, D. A. P.,</author>
		<author>Carreri, Felipe de Campos,</author>
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		<group>LAP-CTE-INPE-MCTI-GOV-BR</group>
		<group>LAP-CTE-INPE-MCTI-GOV-BR</group>
		<group></group>
		<group>LAP-CTE-INPE-MCTI-GOV-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade Federal de São Paulo (UNIFESP)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<electronicmailaddress>alinecapella@gmail.com</electronicmailaddress>
		<title>Effect of nitrogen high temperature plasma based ion implantation on the creep behavior of Ti-6Al-4V alloy</title>
		<journal>Applied Surface Science</journal>
		<year>2014</year>
		<volume>311</volume>
		<keywords>Aluminum, Ion implantation, Nitrogen, Titanium alloys, Constant load creep tests, Creep behaviors, High-temperature plasmas, Micro-structural characterization, Plasma-based ion implantation, Simultaneous formation, Steady state creep rate, Ti-6Al-4V alloy, Creep.</keywords>
		<abstract>Nitrogen high temperature plasma based ion implantation (HTPBII) performed on Ti-6Al-4V significantly improved the creep behavior of the alloy. Treatments were performed for 1 h at a working pressure of 4 mbar and negative high voltage pulses of 7.5 kV, 30 ¼s and 500 Hz were applied on the specimens heated at 800 °C and 900 °C, respectively. Microstructural characterization of the treated samples revealed the formation of nitrided layers, with simultaneous formation of TiN and Ti2N. The most intense peaks of these compounds were obtained at higher treatment temperature, probably due to the diffusion of nitrogen into titanium. The presence of nitrides caused surface hardening up to three times higher in comparison with untreated alloy. Constant load creep tests were conducted on a standard creep machine in air atmosphere, at stress level of 319 MPa at 600 °C. Significant reductions of the steady-state creep rates (µ) were measured for martensitic Ti-6Al-4V treated by nitrogen HTPBII, reaching minimum creep rates of 0.0318 h-1 in comparison with 0.1938 h-1 for untreated sample. The improvement of the creep resistance seems to be associated with the formation of a thick nitrided layer, which acts as a barrier to oxygen diffusion into the material. In addition, the increase of the grain size generated by the heating of the substrate during the treatment can affect some creep mechanisms, leading to a significant reduction of µ. © 2014 Elsevier B.V.</abstract>
		<pages>239-244</pages>
		<language>en</language>
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		<secondarytype>PRE PI</secondarytype>
		<dissemination>WEBSCI; PORTALCAPES; COMPENDEX; SCOPUS.</dissemination>
		<area>FISPLASMA</area>
		<secondarymark>A1_ENGENHARIAS_II A1_ENGENHARIAS_I A1_INTERDISCIPLINAR A2_ENGENHARIAS_III A2_CIÊNCIAS_AGRÁRIAS_I A2_MATERIAIS A2_SAÚDE_COLETIVA B1_GEOCIÊNCIAS B1_ODONTOLOGIA B1_QUÍMICA B1_CIÊNCIAS_BIOLÓGICAS_I B1_ENGENHARIAS_IV B1_MATEMÁTICA_/_PROBABILIDADE_E B1_MEDICINA_II B1_MEDICINA_III B1_FARMÁCIA B1_BIOTECNOLOGIA B2_ENSINO B2_ASTRONOMIA_/_FÍSICA B2_CIÊNCIAS_BIOLÓGICAS_II C_BIODIVERSIDADE</secondarymark>
		<tertiarymark>Trabalho não Vinculado à Tese/Dissertação</tertiarymark>
		<size>2011 KiB</size>
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