@Article{OliveiraOlivReisCarr:2014:EfNiHi,
author = "Oliveira, Aline Capella de and Oliveira, Rogerio de Moraes and
Reis, D. A. P. and Carreri, Felipe de Campos",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de S{\~a}o Paulo (UNIFESP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Effect of nitrogen high temperature plasma based ion implantation
on the creep behavior of Ti-6Al-4V alloy",
journal = "Applied Surface Science",
year = "2014",
volume = "311",
pages = "239--244",
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.",
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.",
doi = "10.1016/j.apsusc.2014.05.047",
url = "http://dx.doi.org/10.1016/j.apsusc.2014.05.047",
issn = "0169-4332",
label = "scopus 2014-11 OliveiraOlivReisCarr:2014:EfNiHi",
language = "en",
urlaccessdate = "03 maio 2024"
}