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The Effect of Powder Size and Morphology on the Sinterability of Bioresorbable Mg-Sr/Ca Alloys

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Magnesium Technology 2024 (TMS 2024)

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

Possessing outstanding biocompatibility and bioresorbability, magnesium (Mg) alloys with strontium (Sr) and calcium (Ca) additions have shown potential to be used as temporary implants in orthopaedic applications. Having a low elastic modulus (45 GPa) close to the human bone lowers the stress shielding effects. Low temperature additive manufacturing (AM) techniques (e.g., Fused Deposition Modelling) have potential to be used for the fabrication of complex Mg components while avoiding safety concerns associated with high temperature AM. However, low sinterability of common Mg alloys is the main limiting factor. The objective of this work is to investigate the effect of powder particle size/morphology on the sinterability of Mg-Ca/Sr-based alloys produced via powder metallurgy. Laser diffraction and Scanning Electron Microscopy (SEM) were used to characterize particle size and morphology. The study also focused on assessing the role of liquid phase sintering (LPS) mechanism by thermodynamic calculations and microstructural characterisation (SEM). Porosity measurements using density analysis and image processing were employed to determine the effects of powder size and morphology on sinterability of the alloys. It was found that the non-homogeneous particle size distribution with more spherical powder particles, facilitated the compaction and accordingly higher densification was obtained. This was achieved for powders milled at higher speeds (900 rpm), resulting in significantly lower porosity levels (~ 6–8%) compared to the dry-milled state (~ 40–60%).

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Acknowledgements

Authors acknowledge the EU financial support received under Marie-Sklodowska Curie Fellowship (AMBIT 101029651). This publication has also emanated from research conducted with the financial support of Science Foundation Ireland under grant number 20/FFP-P/8868. For the purpose of Open Access, the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission. Authors also thank South Eastern Applied Materials (SEAM) Research Centre for their support in conducting laser diffraction experiments.

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Authors and Affiliations

  1. School of Mechanical and Materials Engineering, University College Dublin, Dublin, Ireland

    Ava Azadi, Eoin D. O’Cearbhaill & Mert Celikin

Authors
  1. Ava Azadi
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  2. Eoin D. O’Cearbhaill
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  3. Mert Celikin
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Correspondence to Ava Azadi .

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Editors and Affiliations

  1. The Ohio State University, Columbus, OH, USA

    Aeriel Leonard

  2. Terves Inc./Magnesium-USA, Euclid, OH, USA

    Steven Barela

  3. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

  4. University of Florida, Gainesville, FL, USA

    Victoria M. Miller

  5. Helmholtz-Zentrum Hereon, Geesthacht, Germany

    Domonkos Tolnai

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© 2024 The Minerals, Metals & Materials Society

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Azadi, A., O’Cearbhaill, E.D., Celikin, M. (2024). The Effect of Powder Size and Morphology on the Sinterability of Bioresorbable Mg-Sr/Ca Alloys. In: Leonard, A., Barela, S., Neelameggham, N.R., Miller, V.M., Tolnai, D. (eds) Magnesium Technology 2024. TMS 2024. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-50240-8_39

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