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Instruments / Technical Area	Publication Details	Published	Actions
I13-2-Diamond Manchester Imaging I14-Hard X-ray Nanoprobe	Multi-modal investigation of the bone micro- and ultrastructure, and elemental distribution in the presence of Mg-xGd screws at mid-term healing stages Kamila Iskhakova , Hanna Cwieka , Svenja Meers , Heike Helmholz , Anton Davydok , Malte Storm , Ivo Matteo Baltruschat , Silvia Galli , Daniel Pröfrock , Olga Will , Mirko Gerle , Timo Damm , Sandra Sefa , Weilue He , Keith Macrenaris , Malte Soujon , Felix Beckmann , Julian Moosmann , Thomas O'Hallaran , Roger J. Guillory , D. C. Florian Wieland , Berit Zeller-Plumhoff , Regine Willumeit-Römer Bioactive Materials 41, 657 - 671 DOI: 10.1016/j.bioactmat.2024.07.019 Diamond Proposal Number(s): [25078] Open Access Show Abstract ▼ Abstract: Magnesium (Mg) – based alloys are becoming attractive materials for medical applications as temporary bone implants for support of fracture healing, e.g. as a suture anchor. Due to their mechanical properties and biocompatibility, they may replace titanium or stainless-steel implants, commonly used in orthopedic field. Nevertheless, patient safety has to be assured by finding a long-term balance between metal degradation, osseointegration, bone ultrastructure adaptation and element distribution in organs. In order to determine the implant behavior and its influence on bone and tissues, we investigated two Mg alloys with gadolinium contents of 5 and 10 wt percent in comparison to permanent materials titanium and polyether ether ketone. The implants were present in rat tibia for 10, 20 and 32 weeks before sacrifice of the animal. Synchrotron radiation-based micro computed tomography enables the distinction of features like residual metal, degradation layer and bone structure. Additionally, X-ray diffraction and X-ray fluorescence yield information on parameters describing the bone ultrastructure and elemental composition at the bone-to-implant interface. Finally, with element specific mass spectrometry, the elements and their accumulation in the main organs and tissues are traced. The results show that Mg-xGd implants degrade in vivo under the formation of a stable degradation layer with bone remodeling similar to that of Ti after 10 weeks. No accumulation of Mg and Gd was observed in selected organs, except for the interfacial bone after 8 months of healing. Thus, we confirm that Mg-5Gd and Mg-10Gd are suitable material choices for bone implants.	Nov 2024
I13-2-Diamond Manchester Imaging	Fundamental study of multi-track friction surfacing deposits for dissimilar aluminum alloys with application to additive manufacturing Malte Soujon , Zina Kallien , Arne Roos , Berit Zeller-Plumhoff , Benjamin Klusemann Materials & Design 214 DOI: 10.1016/j.matdes.2022.110786 Diamond Proposal Number(s): [22346] Open Access Show Abstract ▼ Abstract: Friction surfacing is an emerging solid-state coating technology based on frictional heat induced plastic deformation at the tip of a consumable metallic stud that allows to deposit layers with a fine-grained recrystallized microstructure at temperatures below the melting point. The generation of sound, defect-free metallurgical joints between multiple adjacent overlapping friction surfacing deposits, also referred to as multi-track friction surfacing, from dissimilar aluminum alloys is the focus of this experimental work. An extensive volumetric defect analysis is carried out for various overlap configurations, including post-processing strategies in order to assess the inter-track bonding integrity using microscopic characterization techniques and micro-computed tomography. The effect of layer arrangement and overlap distance on the volumetric defect formation in both inter-track and layer-to-substrate interface is quantified and discussed. Post-processing via hybrid friction diffusion bonding process demonstrates a significant reduction in defect volume ratio, proving higher material efficiency. The gained knowledge was used to successfully build a multi-track multi-layer friction surfacing stack, demonstrating the suitability of this process for large-scale additive manufacturing components. The subsequent mechanical analysis reveals excellent homogeneous isotropic tensile properties of the additive structure in the range of the base material tensile strength.	May 2022

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