A5034444782- Metal and Thin Film Mechanics
- Advanced materials and composites
- Microstructure and mechanical properties
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Metallic Glasses and Amorphous Alloys
- Ion-surface interactions and analysis
- Metal Alloys Wear and Properties
- nanoparticles nucleation surface interactions
- Advanced Surface Polishing Techniques
- Fusion materials and technologies
- Intermetallics and Advanced Alloy Properties
- Aluminum Alloys Composites Properties
Montanuniversität Leoben
2019-2022
Thermally activated deformation mechanisms in three different W-Re alloys were investigated by performing high temperature nanoindentation experiments up to 800 °C. With increasing Re content the athermal hardness increases, while temperature-dependent thermal contribution is strongly decreased. This results a reduced strain rate sensitivity for compared pure W. The origin of this effect reduction Peierls potential due Re, manifesting an increased activation volume at lower temperatures....
Dislocation-grain boundary interaction is widely accepted as the rate-controlling process for ultra-fine grained bcc metals in their high temperature deformation regime above critical temperature. However, influence of different types grain boundaries remains unexplored so far. To this end we present here an advanced nanoindentation study on Ta2.5W specimens consisting two distinctively types, but with similar submicron average spacing. While one set samples consisted a predominant fraction...
A new field of application for high temperature nanoindentation as a complimentary method to understand the mechanics plasticity upon bulk phase transformations in thermodynamic equilibrium is introduced. The feasibility outlined on polycrystalline Cobalt involving low-temperature hexagonal closed packed phase, and above 700K, high-temperature face centered cubic which was conventionally characterized by means differential scanning calorimetry X-ray diffraction. Strain rate sensitivity,...
The applicability of nano-crystalline W/Cu composites is governed by their mechanical properties and microstructural stability at high temperatures. Therefore, structural investigations a high-pressure torsion deformed nanocomposite were performed up to temperature 600 °C. Furthermore, the material was annealed several temperatures for 1 h within high-vacuum furnace determine changes surface effects. No significant increase grain size, but distinct evaporation Cu phase accompanied pool...
Abstract Silicon is of great economic importance for the semiconductor industry as well academic interest because its high-pressure phase transformations. These transformations also occur during indentation silicon. To further investigate these transformations, a modified method using continuous stiffness measurement (CSM) unloading presented in this work. The use CSM signal allows directly calculating mean contact pressure while unloading. measurements will be compared to conventional tests...
Abstract Due to their outstanding properties, ultra-fine-grained tungsten and its alloys are promising candidates be used in harsh environments, hence it is crucial understand high temperature behavior underlying deformation mechanisms. Therefore, advanced nanoindentation techniques were applied tungsten–rhenium up 1073 K. A continuous hardness decrease 0.2 $$T_{\text{m}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>T</mml:mi> <mml:mtext>m</mml:mtext>...
Abstract When nanoindentation tests are performed on aluminum alloys, pile-ups can be observed in the area of plastic deformation elastic-plastic indent. These may have an impact actual contact between indenter and sample hence, a significant influence measured mechanical properties. This work analyzed pile-up behavior precipitation hardening (AA2024) solid solution strengthened (AA5182) Al wrought alloy their coarse-grained ultrafine-grained condition. Here, residual indents were examined...
Abstract Beryllium has an extraordinary combination of material properties such as low density, high melting point, specific heat capacity, Young's modulus, hardness and atomic number. The conventional investigation the mechanical Be alloys is only possible under difficult conditions due to material's toxicity resulting restrictions on sample manufacturing. These limitations are avoided, at least partly, when using a depth-sensing test, also called nanoindentation, where contamination with...