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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	Direct evidence for dynamic phase transformation during high temperature deformation in Ti-64 Christopher Daniel , Chi-Toan Nguyen , Michael D. Atkinson , João Quinta Da Fonseca The 14th World Conference on Titanium DOI: 10.1051/matecconf/202032112037 Open Access Show Abstract ▼ Abstract: The microstructure of Ti-64 strongly affects the forming and in-service behaviour of aerospace components. The development of microstructure, including crystallographic texture, during thermomechanical processing involves changes caused by deformation, annealing and phase transformation. Recently, it has been reported that deformation and transformation occur concurrently, in a dynamic α → β transformation process, driven by the net flow softening it produces. Here, we present the results of an in-situ synchrotron diffraction experiment that aimed to detect and measure the extent of dynamic phase transformation during hot deformation and its contribution to the crystallographic texture of the alloy. Forged Ti-64 samples were deformed in uniaxial tension at 950°C and a strain rate of about 0.02 s-1, using an electro-thermal mechanical tester (ETMT) mounted on the I12: JEEP beamline at Diamond Light Source. By using a high energy 89 keV synchrotron X-ray beam and a fast acquisition rate (10 Hz) we were able to measure, during deformation, the internal elastic lattice strains in the two phases, the crystallographic texture of both phases and the α → β phase fraction. The results show, for the first time, direct evidence of dynamic transformation during isothermal hot deformation.	Oct 2020
I12-JEEP: Joint Engineering, Environmental and Processing	Application of a new method for accurate determination of α and β texture in Ti-6Al-4 V from synchrotron diffraction intensities Christopher S. Daniel , Xiaohan Zeng , Stefan Michalik , Simon A. Hunt , Joao Quinta Da Fonseca Materials Characterization DOI: 10.1016/j.matchar.2023.112769 Diamond Proposal Number(s): [25682] Open Access Show Abstract ▼ Abstract: The crystallographic texture development during processing of dual-phase Ti alloys like Ti-6Al-4 V is of fundamental technological importance. However, measuring texture in both phases in these materials is a significant challenge because of the spatial inhomogeneity of the texture and low volume fraction of the minority β-phase at room temperature. Here we demonstrate how synchrotron X-ray diffraction can be used to overcome these difficulties and measure texture and texture variation in hot-rolled samples in a reproducible manner. The texture in hot-rolled Ti-64 was calculated from 2D synchrotron diffraction patterns obtained along different directions. The data was analysed using MAUD, which is based on Rietveld refinement of the diffracted intensities, and using a Fourier series based analysis method, that extracts intensities directly from the 2D diffraction patterns, and then uses the open-source software MTEX to fit an orientation distribution function (ODF). By comparing the results with faithful EBSD measurements, we show that the Fourier series method produces much more accurate texture measurements, especially for the minority β-phase. We also show that a minimum of 2, and preferably 3, different measurement orientations are needed to fully represent the texture. This implies that measurements of texture which rely on diffraction data from a single sample orientation, like in fast in-situ studies or spatially resolved measurements, can only provide qualitative information and must be interpreted with care.	Mar 2023

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