| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Birosca, Soran
University of Portsmouth
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2024Probing the temperature field and residual stress transformation in multi-track, multi-layered systemcitations
- 2024The corrosion mechanism of grey cast-iron yacht keel in marine environment during long-term exposure
- 2023A study of high cycle fatigue life and its correlation with microstructural parameters in IN713C nickel-based superalloycitations
- 2021Crystallographic orientation influence on slip system activation and deformation mechanisms in Waspaloy during in-situ mechanical loadingcitations
- 2020Mechanistic approach of Goss abnormal grain growth in electrical steelcitations
- 2020The effects of grain size, dendritic structure and crystallographic orientation on fatigue crack propagation in IN713C nickel-based superalloycitations
- 2020On the correlation between magnetic domain and crystallographic grain orientation in grain oriented electrical steelscitations
- 2019Crystallographic orientation relationship with geometrically necessary dislocation accumulation during high-temperature deformation in RR1000 nickel-based superalloycitations
- 2019The dislocation behaviour and GND development in a nickel based superalloy during creepcitations
- 2018The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloycitations
- 2018A study of low cycle fatigue life and its correlation with microstructural parameters in IN713C nickel based superalloycitations
- 2017Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloyscitations
- 2017The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel.
- 2017The effect of a two-stage heat-treatment on the microstructural and mechanical properties of a maraging steelcitations
- 2016The effect of strain distribution on microstructural developments during forging in a newly developed nickel base superalloycitations
- 2016The hierarchy of microstructure parameters affecting the tensile ductility in centrifugally cast and forged Ti-834 alloy during high temperature exposure in aircitations
- 2016Deformation mechanisms of IN713C nickel based superalloy during Small Punch Testingcitations
- 2015Nanostructure characterisation of flow-formed Cr-Mo-V steel using transmission Kikuchi diffraction techniquecitations
- 2011A combined approach to microstructure mapping of an Al-Li AA2199 friction stir weldcitations
- 20113-D observations of short fatigue crack interaction with lamellar and duplex microstructures in a two-phase titanium alloycitations
- 20093D characterisation of short fatigue crack in Ti 6246
- 2009Three-dimensional characterization of fatigue cracks in Ti-6246 using X-ray tomography and electron backscatter diffractioncitations
- 2008Texture evolution in grain-oriented electrical steel during hot band annealing and cold rollingcitations
- 2007Influence of Normalizing Conditions on Electrical Steel Texture Development
- 2005Phase identification of oxide scale on low carbon steelcitations
- 2005Phase determination and microstructure of oxide scales formed on steel at high temperaturecitations
Places of action
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article
The hierarchy of microstructure parameters affecting the tensile ductility in centrifugally cast and forged Ti-834 alloy during high temperature exposure in air
Abstract
<p>Ductility regression is the main concern in using Ti-834 titanium alloy at temperatures above 500 °C for aerospace applications. The reduction of ductility in titanium alloys at high temperatures is strongly correlated to the exposure time. In the current study the effect of prolonged exposure at 500 °C on the tensile ductility of two differently processed Ti-834 alloys was investigated. In order to simulate actual Ti-834 processing routes, forged and centrifugally cast materials were used. The tensile tests were conducted on various specimens exposed at 500 °C for 100, 200 and 500 h to observe microstructure feature changes. Moreover, the effect of microstructure, microtexture, α-case, α<sub>2</sub> and silicide precipitate coarsening during high temperature exposure was studied thoroughly. The cast alloy was found to have a minimum ductility and failed at 1.8% strain after exposure at 500 °C/500 h when the α-case layer was retained during testing, whilst, the ductility of the forged alloy was unaffected. The effects of individual microstructural parameters on the ductility regression in Ti-834 alloy were quantified. The results showed that 7.1% strain differences between the cast and forged alloy are related to microstructural variations including; morphology, lath widths, grain size and shape, grain orientations and microtexture. A total of 9.6% strain loss was observed in centrifugally cast Ti-834 after aging at 500°C/500 h and quantified as follow; 3.6% due to α-case formation during high temperature exposure, 0.2% due to α<sub>2</sub>-precipitates coarsening, 4.4% due to further silicide formation and coarsening, 1.4% due to additional microstructure changes during high temperature exposure. Furthermore, silicide coarsening on α/β phase boundaries caused large void formation around the precipitates. A theoretical model supported by experimental observations for silicide precipitation in fully colony and duplex microstructures was established. The element partitioning during exposure caused Al and Ti depletion in the vicinity of the β phase in the lamellae, i.e., α<sub>s</sub> area. This resulted in lowering the strength of the alloy and facilitated the formation of Ti<sub>3</sub>(SiZr)<sub>2</sub> precipitates. The Al depletion and nano-scale partitioning observed at the α<sub>s</sub>/β boundaries resulted in easy crack initiation and promoted propagation in the centrifugally cast colony microstructure and reduced the basal slip τ<sub>crss</sub>. Furthermore, silicides were not formed in α<sub>p</sub> (high Al, Ti and low Zr areas) in the forged duplex microstructure that promoted superior mechanical performance and ductility over the cast alloy.</p>