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Schröttner, Hartmuth
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Publications (6/6 displayed)
- 2021Influence of high-pressure torsion deformation on the corrosion behaviour of a bioresorbable Mg-based alloy studied by positron annihilationcitations
- 2021High-Resolution Microstructure Characterization of Additively Manufactured X5CrNiCuNb17-4 Maraging Steel during Ex and In Situ Thermal Treatmentcitations
- 2020Microstructure Investigations of Powders and Additive Manufactured Partscitations
- 2019Carbohydrates@MOFscitations
- 2012Formation of liquid and solid products from liquid phase pyrolysiscitations
- 2012Investigation of friction stir welding of stainless steel using a stop-action-techniquecitations
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article
Influence of high-pressure torsion deformation on the corrosion behaviour of a bioresorbable Mg-based alloy studied by positron annihilation
Abstract
The effect of high-pressure torsion (HPT) on the corrosion behavior of extruded ZX00 (Mg–0.45wt%Zn–0.45wt%Ca) in phosphate buffered saline solution is investigated. MgCaZn alloys are promising candidates for the use as bioresorbable implant materials and, therefore, are in the focus of current research. To improve their strength, severe plastic deformation, e.g. via the technique of HPT, can be used. Positron lifetime spectroscopy (PLS) is applied as sensitive tool for studying open-volume defects which evolve during HPT processing and subsequent corrosion. The studies were complemented by electrochemical impedance spectroscopy (EIS). In the uncorroded state, grain boundaries are the major type of positron trap as quantitatively analysed by means of diffusion-reaction models for positron trapping and annihilation in fine-grained alloys. Upon corrosion, positronium formation and annihilation indicate larger open-volume structures, such as pores and cracks, in the emerging corrosion product and oxide layers. Both PLS and EIS clearly show that HPT-deformation strongly reduces the resistance against corrosion. Evidence is found for corrosion-induced open-volume defects, presumably related to hydrogen, in deeper parts of the material below the corrosion layer.