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18 results on '"Mingler, Bernhard"'

4. Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatments

Author

Mizelli-Ojdanic, Andrea, Horky, Jelena, Mingler, Bernhard, Fanetti, Mattia, Gardonio, Sandra, Valant, Matjaz, Sulkowski, Bartosz, Schafler, Erhard, Orlov, Dmytro, and Zehetbauer, Michael J.

Subjects
Technology, Microscopy, QC120-168.85, QH201-278.5, Engineering (General). Civil engineering (General), Article, TK1-9971, magnesium alloys, Descriptive and experimental mechanics, biodegradability, severe plastic deformation (SPD), precipitates, Electrical engineering. Electronics. Nuclear engineering, TA1-2040, vacancy agglomerates
Abstract

In this study, several biodegradable Mg alloys (Mg5Zn, Mg5Zn0.3Ca, Mg5Zn0.15Ca, and Mg5Zn0.15Ca0.15Zr, numbers in wt%) were investigated after thermomechanical processing via high-pressure torsion (HPT) at elevated temperature as well as after additional heat treatments. Indirect and direct analyses of microstructure revealed that the significant strength increases arise not only from dislocations and precipitates but also from vacancy agglomerates. By contrast with former low-temperature processing routes applied by the authors, a significant ductility was obtained because of temperature-induced dynamic recovery. The low initial values of Young's modulus were not significantly affected by warm HPT-processing. nor by heat treatments afterwards. Also, corrosion resistance did not change or even increase during those treatments. Altogether, the study reveals a viable processing route for the optimization of Mg alloys to provide enhanced mechanical properties while leaving the corrosion properties unaffected, suggesting it for the use as biodegradable implant material.

Published
2021

11. Radiation damage during HRTEM studies in pure Al and Al alloys

Author

Mingler, Bernhard and Karnthaler, H. Peter

Abstract

During transmission electron microscopy (TEM) investigations of Al alloys, defects caused by the electron irradiation can occur. Since the image contrast of these irradiation defects is similar to that of early stages of precipitates, care is needed to avoid confusion. In the present paper the formation and the coarsening of radiation damage defects were studied by in situ TEM in both, pure Al and Al alloys. High-resolution (HR)TEM images show on an atomic level that the radiation defects are extrinsic Frank loops (some converted into unfaulted prismatic loops); they are distributed homogeneously within the TEM foil but inhomogeneously on the four {111} planes. Applying HRTEM imaging conditions, the minimum electron energy causing defects is found to be as low as 110 keV using a [110] beam direction. The results for pure Al are very similar to those of the Al alloys. Therefore, during HRTEM studies (using accelerating voltages > 100 kV) the formation of radiation defects seems inevitable; they can be distinguished from the early stages of precipitates if they lie on different planes.

Published
2022
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