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Instruments / Technical Area	Publication Details	Published	Actions
I13-2-Diamond Manchester Imaging	Time resolved in-situ multi-contrast X-ray imaging of melting in metals Lorenzo Massimi , Samuel J. Clark , Sebastian Marussi , Adam Doherty , Saurabh M. Shah , Joachim Schulz , Shashidhara Marathe , Christoph Rau , Marco Endrizzi , Peter D. Lee , Alessandro Olivo Scientific Reports 12 DOI: 10.1038/s41598-022-15501-2 Diamond Proposal Number(s): [23760] Open Access Show Abstract ▼ Abstract: In this work, the application of a time resolved multi-contrast beam tracking technique to the investigation of the melting and solidification process in metals is presented. The use of such a technique allows retrieval of three contrast channels, transmission, refraction and dark-field, with millisecond time resolution. We investigated different melting conditions to characterize, at a proof-of-concept level, the features visible in each of the contrast channels. We found that the phase contrast channel provides a superior visibility of the density variations, allowing the liquid metal pool to be clearly distinguished. Refraction and dark-field were found to highlight surface roughness formed during solidification. This work demonstrates that the availability of the additional contrast channels provided by multi-contrast X-ray imaging delivers additional information, also when imaging high atomic number specimens with a significant absorption.	Jul 2022
I13-2-Diamond Manchester Imaging	Mechanisms of gas and shrinkage porosity formation in solidifying shear bands Shishira Bhagavath , Zhixuan Gong , Tim Wigger , Saurabh Shah , Bita Ghaffari , Mei Li , Shashidhara Marathe , Shyamprasad Karagadde , Peter D. Lee Journal Of Materials Processing Technology 26 DOI: 10.1016/j.jmatprotec.2021.117338 Diamond Proposal Number(s): [22053] Show Abstract ▼ Abstract: In specialised solidification processing techniques such as High Pressure Die Casting, Twin-Roll Casting and others, an additional external deformation load is applied to achieve the required shape, leading to the formation of microstructural features such as shear bands. The mechanism for forming these features is believed to be dependent on dynamically evolving strain fields, which are dependent on the local solid fraction, applied strain rates and casting geometry. To investigate this, a semisolid ( 50 % solid fraction) Al-10 wt.% Cu alloy is isothermally injected into a bespoke die using a custom-designed thermo-mechanical rig. The semisolid deformation, formation of Cu-rich dilatant bands and subsequent pore nucleation and growth are captured using fast synchrotron X-ray radiography. The local normal and shear strains acting on the mush are quantified using Digital image correlation to identify the dilatant shear bands and the dominant local strain component. Correlating the radiographs with strain maps reveals that gas pores within the dilated interstices grow, while those in compressed regions are squeezed out. A linear correlation between accumulated volumetric strain and porosity volume fraction demonstrates that higher dilations give rise to a local increase in both gas and shrinkage porosity.	Aug 2021

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