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Instruments / Technical Area	Publication Details	Published
I12-JEEP: Joint Engineering, Environmental and Processing	In-situ synchrotron investigation of the elastic and tensile properties of oxide dispersion strengthened EUROFER97 steel Tay Sparks , Slava Kuksenko , Michael Gorley , Jan Hoffmann , Yu-Lung Chiu , Thomas Connolley , Michael Rieth , Yiqiang Wang , Biao Cai Acta Materialia 45 DOI: 10.1016/j.actamat.2024.119876 Diamond Proposal Number(s): [19251] Open Access Show Abstract ▼ Abstract: The augmentation of mechanical properties of reduced activation ferritic martensitic steels through the introduction of creep resistant nano-oxide particles produces a class of oxide dispersion strengthened steels, which have attracted significant interest as candidates for first wall supporting structural materials in future nuclear fusion reactors. In the present work, the effect of temperature on the elastic properties and micro-mechanics of 0.3 wt% Y2O3 oxide dispersion strengthened steel EUROFER97 is investigated using synchrotron high energy X-ray diffraction in-situ tensile testing at elevated temperatures, alongside the non-oxide strengthened base steel as a point of comparison. The single crystal elastic constants of both steels are experimentally determined through analysis of the diffraction peaks corresponding to specific grain families in the polycrystalline samples investigated. The effect of temperature on the evolving dislocation density and character in both materials is interrogated, providing insight into deformation mechanisms. Finally, a constitutive flow stress model is used to evaluate the factors affecting yield strength, allowing the strengthening contribution of the oxide particles to be assessed, and correlation between the thermally driven microstructural behaviour and macroscopic mechanical response to be determined.	Apr 2024
I12-JEEP: Joint Engineering, Environmental and Processing	Revealing growth mechanisms of faceted Al2Cu intermetallic compounds via high-speed synchrotron X-ray tomography Zihan Song , Oxana V. Magdysyuk , Tay Sparks , Yu-Lung Chiu , Biao Cai Acta Materialia 5 DOI: 10.1016/j.actamat.2022.117903 Diamond Proposal Number(s): [19216] Open Access Show Abstract ▼ Abstract: This study usedhigh-speed synchrotron X-ray tomography to image the growth of Al2Cu intermetallic compoundsin 4D (3D plus time) during solidification of Al-45wt%Cu alloy. Two categories of growth patterns (basic units and dendrites) are identified. Basic unitsare elongated rods whose cross-section areL, U orhollow-rectangularshapes. The transition from L pattern to U and finally to hollow-rectangularshaped morphologywas observed. Faceted dendritic patterns include equiaxed prism and columnar dendrites. Self-repeated layer-by-layer stacking of the basic units (such as L shaped particles) is proposed as a governing mechanism for the growth of Al2Cu faceted dendrites. The growth orientation and morphologies of these patterns are strongly influenced by solidification conditions (temperature gradients, cooling rates and external magnetic fields). Another finding is that when rotating Al-45wt%Cu during upwards directional solidification,under a transverse magnetic field of 0.5T, highly refined and well aligned Al2Cu intermetallic compounds are obtained, much finer than those without the imposition of the magnetic field. This is attributed to a rotational stirring flow that modulates and regulates the temperature and solute distribution.The developed experimental findings provide a physical understanding of the formation of faceted intermetallic compounds during solidification.	Mar 2022
I12-JEEP: Joint Engineering, Environmental and Processing	Growth dynamics of faceted Al13Fe4 intermetallic revealed by high-speed synchrotron X-ray quantification Zihan Song , Oxana V. Magdysyuk , Lei Tang , Tay Sparks , Biao Cai Journal Of Alloys And Compounds DOI: 10.1016/j.jallcom.2021.158604 Diamond Proposal Number(s): [19216] Show Abstract ▼ Abstract: High-speed synchrotron tomography was used to investigate the nucleation and growth dynamics of Al13Fe4 intermetallic during solidification of an Al-5wt%Fe alloy, providing new insights into its formation process. The majority of Al13Fe4 intermetallics nucleated near the surface oxide of the specimen and a few nucleated at Al13Fe4 phase. Al13Fe4 crystals grew into a variety of shapes, including plate-like, hexagonal tabular, stair-like and V-shaped, which can be attributed to the crystal structure of this compound and its susceptibility to twinning. Hole-like defects filled with aluminium melt were observed within the intermetallics. Oriented particle attachment mechanism was proposed to explain the formation of the Al13Fe4 intermetallic, which needs further experiments and simulation to confirm.	Apr 2021

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