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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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Davis, Alec E.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2024Achieving a columnar-to-equiaxed transition through dendrite twinning in high deposition rate additively manufactured titanium alloyscitations
- 2024Grain-scale in-situ study of discontinuous precipitation in Mg-Alcitations
- 2024Understanding fatigue crack propagation pathways in Additively Manufactured AlSi10Mgcitations
- 2024In-Situ EBSD Study of Austenitisation in a Wire-Arc Additively Manufactured High-Strength Steelcitations
- 2024Identification, classification and characterisation of hydrides in Zr alloyscitations
- 2023β grain refinement during solidification of Ti-6Al-4V in Wire-Arc Additive Manufacturing (WAAM)citations
- 2022β Grain refinement by yttrium addition in Ti-6Al-4V Wire-Arc Additive Manufacturingcitations
- 2022Comparison of microstructure refinement in wire-arc additively manufactured Ti–6Al–2Sn–4Zr–2Mo–0.1Si and Ti–6Al–4V built with inter-pass deformationcitations
- 2022Microstructural characterisation and mechanical properties of Ti-5Al-5V-5Mo-3Cr built by wire and arc additive manufacturecitations
- 2022Optimising large-area crystal orientation mapping of nanoscale β phase in α + β titanium alloys using EBSDcitations
- 2022CALPHAD-informed phase-field model for two-sublattice phases based on chemical potentials: η-phase precipitation in Al-Zn-Mg-Cu alloyscitations
- 2021β Grain refinement by yttrium addition in Ti-6Al-4V Wire-Arc Additive Manufacturingcitations
- 2021The potential for grain refinement of wire-arc additive manufactured (WAAM) Ti-6Al-4V by ZrN and TiN inoculationcitations
- 2021Effect of deposition strategies on fatigue crack growth behaviour of wire+ arc additive manufactured titanium alloy Ti-6Al-4Vcitations
- 2021Preageing of Magnesium Alloyscitations
- 2021In-Situ Observation of Single Variant α Colony Formation in Ti-6Al-4Vcitations
- 2021The Potential for Grain Refinement of Wire-Arc Additive Manufactured (WAAM) Ti-6Al-4V by ZrN and TiN Inoculationcitations
- 2021Microstructure transition gradients in titanium dissimilar alloy (Ti-5Al-5V-5Mo-3Cr/Ti-6Al-4V) tailored wire-arc additively manufactured componentscitations
- 2020The effect of processing parameters on rapid-heating β recrystallization in inter-pass deformed Ti-6Al-4V wire-arc additive manufacturingcitations
- 2020On the observation of annealing twins during simulating β-grain refinement in Ti–6Al–4V high deposition rate AM with in-process deformationcitations
- 2019Reducing yield asymmetry and anisotropy in wrought magnesium alloys – a comparative studycitations
- 2019Mechanical performance and microstructural characterisation of titanium alloy-alloy composites built by wire-arc additive manufacturecitations
- 2019Mechanical performance and microstructural characterisation of titanium alloy-alloy composites built by wire-arc additive manufacturecitations
- 2019Automated Image Mapping and Quantification of Microstructure Heterogeneity in Additive Manufactured Ti6Al4Vcitations
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article
In-Situ Observation of Single Variant α Colony Formation in Ti-6Al-4V
Abstract
Much of the current understanding of the β → α + β phase transformation in the commercially important titanium alloy Ti-6Al-4V (Ti64) is by inference from more β-stabilised analogues, or post-mortem studies. In-situ cooling experiments have been conducted for the first time on Ti64 samples, in an adapted SEM with a high temperature heating stage, while performing real-time secondary electron video recording and sequential electron backscatter diffraction mapping. This has enabled direct observation of the development of grain boundary (GB) α colony microstructures, when cooling at relatively low rates (0.3 – 0.1°C s−1) through the β transus. It is shown that the α colonies develop discontinuously, with relatively widely spaced larger ‘primary’ α lamellae nucleating first at lower undercoolings at β GBs, which grow out rapidly into the grains until impingement. These primary laths form a ‘skeletal template’ for the subsequent colonies by determining the variant selected within their domain of influence, as the extent of transformation increases. This occurs through biasing the subsequent sympathetic autocatalytic nucleation of finer secondary α laths combined with branching and plate broadening, to ‘infill’ the remaining β matrix with laths of the same variant. Evidence has also been provided that is in agreement with previous studies of the crystallographic relationships between the nucleating GB α allotriomorph variants, colonies, and the β GBs. However, GB α allotriomorphs were not always found to be a pre-requirement for the development of single variant α colonies in Ti64 (at least when observed at a surface), with the primary α laths seen to nucleate directly off β GBs in competition with the GB α allotriomorphs in many cases.