A5074474210- Metal Alloys Wear and Properties
- Metallurgical and Alloy Processes
- Aluminum Alloys Composites Properties
- Microstructure and Mechanical Properties of Steels
- Mechanical stress and fatigue analysis
- Gear and Bearing Dynamics Analysis
- Intermetallics and Advanced Alloy Properties
- Advanced machining processes and optimization
- Metal and Thin Film Mechanics
- Aluminum Alloy Microstructure Properties
- Magnesium Alloys: Properties and Applications
- Advanced Materials Characterization Techniques
- Corrosion Behavior and Inhibition
- Adhesion, Friction, and Surface Interactions
RWTH Aachen University
2018-2024
The influence of chemical composition changes on the room temperature mechanical properties in binary Ca33Al67 C15 CaAl2 Laves phase were investigated two ternary alloys with off-stoichiometric compositions 5.7 at.% Mg substitution (Ca33Al61Mg6) and 10.8 3.0 Ca (Ca36Al53Mg11) compared to stoichiometric (Ca33Al67) composition. Cubic Ca-Al-Mg phases multiple crystallographic orientations characterised deformed using nanoindentation. hardness indentation modulus measured be 4.1 ± 0.3 GPa 71.3...
An investigation on the White Etching Crack (WEC) phenomenon as a severe damage mode in bearing applications led to observation that latent pre-damage state period, visible alterations appear surface of raceway. A detailed inspection microstructure underneath reveals existence plenty nano-sized pores depth range 80 µm 200 µm. The maximum Hertzian stress is calculated be at 127 subsurface. present study investigates effect these nanopores fatigue crack initiation SAE 52100 martensitic...
The electrochemical corrosion mechanisms of Mg alloys were extensively studied in previous investigations different chemical compositions, modified surface states and various electrolyte conditions. However, recent research focused on the active state dissolution, leading to unresolved effects secondary phases adjacent a stable α-solid solution passive layer. present study investigates fundamental three Laves with varying phase morphologies fractions Mg-Al-Ca alloys. microstructure was...
The appearance of White Etching Cracks (WEC), not covered by the ISO 281 modified failure rate calculation, leads to difficulties in predicting bearing reliability. This uncertainty applications a worldwide activity order understand and prevent this situation since WEC mode deviates from traditional Rolling Contact Fatigue (RCF) mode. Plenty factors have been found influence phenomenon over years, however precise initiation is still under debate. In analyze temporal evolution, interrupted...
During machining, the machined surface is modified due to thermal, mechanical and chemical loads applied by used process. Temperature, temperature gradients, strain gradients lead a change of microstructure in zone. Internal material are difficult access experimental measuring methods during processing. Therefore, this work aims at solving inverse problem determining resulting internal thermal grind hardening based on characterized modifications. hardening, high workpiece. This leads phase...
The influence of chemical composition changes on the room temperature mechanical proper-ties in C15 CaAl2 Laves phase were investigated two off-stoichiometric compositions with 5.7 at.-% Mg addition (Ca33Al61Mg6) and 10.8 3.0 Ca (Ca36Al53Mg11) compared to stoichiometric (Ca33Al67) composition. Cubic Ca-Al-Mg phases multiple crystallographic orientations characterised deformed using nanoindentation. hardness indentation modulus measured be 4.1 +- 0.3 GPa 71.3 1.5 for Ca36Al53Mg11, 4.6 0.2...
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