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Wurster, Stefan
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Topics
Publications (12/12 displayed)
- 2024Stabilization of mechanical strength in a nanocrystalline CoCrNi concentrated alloy by nitrogen alloying
- 2024Influence of Severe Plastic Deformation on the Magnetic Properties of Sm–Co Permanent Magnetscitations
- 2023Magnetic Properties of a High-Pressure Torsion Deformed Co-Zr Alloycitations
- 2023Toxic element-free Ti-based metallic glass ribbons with precious metal additionscitations
- 2022Magnetron Sputtered Non‐Toxic and Precious Element‐Free TiZrGe Metallic Glass Nanofilms with Enhanced Biocorrosion Resistancecitations
- 2022Oxide-stabilized microstructure of severe plastically deformed CuCo alloyscitations
- 2022Tuning mechanical properties of ultrafine-grained tungsten by manipulating grain boundary chemistrycitations
- 2021Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasmacitations
- 2021Nanocrystalline FeCr alloys synthesised by severe plastic deformation – A potential material for exchange bias and enhanced magnetostrictioncitations
- 2021Sampling the Cu–Fe–Co phase diagram by severe plastic deformation for enhanced soft magnetic propertiescitations
- 2020Strain Induced Anisotropic Magnetic Behaviour and Exchange Coupling Effect in Fe-SmCo5 Permanent Magnets Generated by High Pressure Torsioncitations
- 2011Influence of Impurities on the Fracture Behaviour of Tungstencitations
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document
Stabilization of mechanical strength in a nanocrystalline CoCrNi concentrated alloy by nitrogen alloying
Abstract
The mechanical performance and microstructures of a CoCrNi medium-entropy alloy (MEA) and NCoCrNi, alloyed with 0.5at% N, after high pressure torsion (HPT) and subsequent annealing treatments in a temperature range of 150-1000 °C were investigated. The introduction of N results in a reduction of grain size by 40% and ~10-15% increased hardness and bending strength after HPT. Both materials showed strain hardening and plasticity after HPT even at these strength levels over 1500 MPa which is induced by the saturated nanocrystalline state. Annealing at intermediate temperatures of 300-500 °C resulted in an additional increase of hardness and strength by ~20-40%, compared to the HPT deformed state. This effect was ~10 % more pronounced in the nitrogen alloyed CoCrNi that also showed better thermal stability. However, the increase in strength after 500 °C annealing was accompanied by a drastic loss of ductility in both materials.