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Mechanical and Corrosion Properties of Two Precipitation-Hardened Mg-Y-Nd-Gd-Dy Alloys with Small Changes in Chemical Composition

  • Characterization of Biodegradable Medical Materials
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Abstract

Precipitation hardening in Mg-Y-Nd alloys (WE-type) is based on finely dispersed particles offering an effective strengthening mechanism to achieve high strength at moderate ductility. However, these particles often affect corrosion by being more noble than the matrix. Biodegradable implant materials should show a corrosion rate fit to its application but should be free of pitting corrosion. Especially deep and narrow pits act as notches and cause increased mechanical stress leading into early failure. WE43 has already shown to have an acceptable biological response. In this study, two Mg-Y-Nd-Gd-Dy alloys, WE32 and WE33, in extruded, solution and precipitation heat-treated conditions have been investigated. The difference in alloy composition is not very high. Solution heat treatment (T4) causes grain growth and strength loss. The ageing response to peak hardness depends on the temperature. A rather short ageing response was observed for 250°C, and highest hardness has been found for 200°C at longer ageing time but higher hardness compared to 250°C. Grain growth during ageing is not significant. The higher alloyed alloy WE33 shows better mechanical strength, but less ductility. Corrosion was evaluated with immersion and potentiodynamic polarization in Ringer Acetate solution. The corrosion rate strongly depends on the alloy and heat-treatment condition as well as on the test method. The highest corrosion rate is observed in the solution-treated condition. The peak aged alloy shows the lowest corrosion rate, but non-uniform corrosion and has been evaluated by the pitting factor.

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Acknowledgements

The authors thank the Extrusion Center Berlin in Germany for extruding the bars and acknowledge the support of Hartmut Habeck and Benjamin Clausius from UAS Stralsund. Julia Bode from TU Bergakademie Freiberg, Germany, is thanked for ICP-OES measurements.

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Authors and Affiliations

  1. University of Applied Science Stralsund, Stralsund, Germany

    P. Maier, N. Lauth & M. Bechly

  2. Brunel University London, Brunel Centre for Advanced Solidification Technology, London, UK

    C. L. Mendis

  3. Helmholtz-Zentrum Geesthacht, Magnesium Innovation Centre, Geesthacht, Germany

    N. Hort

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  1. P. Maier
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Maier, P., Lauth, N., Mendis, C.L. et al. Mechanical and Corrosion Properties of Two Precipitation-Hardened Mg-Y-Nd-Gd-Dy Alloys with Small Changes in Chemical Composition. JOM 71, 1426–1435 (2019). https://doi.org/10.1007/s11837-019-03359-1

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  • DOI: https://doi.org/10.1007/s11837-019-03359-1

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