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Instruments / Technical Area	Publication Details	Published
I13-2-Diamond Manchester Imaging	Synchrotron quantification of ultrasound cavitation and bubble dynamics in Al–10Cu melts W. W. Xu , I. Tzanakis , P. Srirangam , W. U. Mirihanage , D. G. Eskin , A. J. Bodey , P. D. Lee Ultrasonics Sonochemistry 31, 355 - 361 DOI: 10.1016/j.ultsonch.2016.01.017 Diamond Proposal Number(s): [9082] Show Abstract ▼ Abstract: Knowledge of the kinetics of gas bubble formation and evolution under cavitation conditions in molten alloys is important for the control casting defects such as porosity and dissolved hydrogen. Using in situ synchrotron X-ray radiography, we studied the dynamic behaviour of ultrasonic cavitation gas bubbles in a molten Al–10 wt% Cu alloy. The size distribution, average radius and growth rate of cavitation gas bubbles were quantified under an acoustic intensity of 800 W/cm2 and a maximum acoustic pressure of 4.5 MPa (45 atm). Bubbles exhibited a log-normal size distribution with an average radius of 15.3 ± 0.5 μm. Under applied sonication conditions the growth rate of bubble radius, R(t), followed a power law with a form of R(t) = αtβ, and α = 0.0021 & β = 0.89. The observed tendencies were discussed in relation to bubble growth mechanisms of Al alloy melts.	Jul 2016
I13-2-Diamond Manchester Imaging	Synchrotron radiographic studies of ultrasonic melt processing of Metal Matrix Nano Composites Wajira Mirihanage , Wenwu Xu , Javier Tamayo-ariztondo , Dmitry Eskin , Mirian Garcia-fernandez , Prakash Srirangam , Peter Lee Materials Letters DOI: 10.1016/j.matlet.2015.11.022 Diamond Proposal Number(s): [5001] Show Abstract ▼ Abstract: Fast synchrotron radiography was used to investigate ultrasonic cavitation bubble formation and their dynamics during liquid metal processing of Al-Cu metal matrix nano composites (MMNC) in comparison with conventional alloys. The experimental observations showed enhanced cavitation potential in MMNC melts, due to the presence of Al2O3 nano particles which were believed to be acting as heterogeneous nuclei for bubble formation. Quantitative image analysis demonstrates that the addition of nano particles increases melt agitation partially, while introducing higher flow velocity variations across the melt. This suggests that the presence of nano particles may substantially alter propensity for ultrasonic treatment effects during solidification processing of MMNCs.	Feb 2016
I13-2-Diamond Manchester Imaging	In Situ Synchrotron Radiography of Ultrasound Cavitation in a Molten Al-10Cu Alloy Wenwu Xu , Iakovos Tzanakis , Prakash Srirangam , Sofiane Terzi , Wajira Mirihanage , Dmitry Eskin , Ragnvald Mathiesen , Andrew Horsfield , Peter Lee The Minerals, Metals & Materials Society 2015 DOI: 10.1002/9781119093466.ch9 Diamond Proposal Number(s): [9082]	Feb 2015

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