A5003273861- Microstructure and mechanical properties
- Metal Forming Simulation Techniques
- Aluminum Alloys Composites Properties
- High-Velocity Impact and Material Behavior
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Metal Alloys Wear and Properties
- Particle Detector Development and Performance
- Metallurgy and Material Forming
- Electromagnetic Launch and Propulsion Technology
- Metal and Thin Film Mechanics
- Particle Accelerators and Free-Electron Lasers
- Aluminum Alloy Microstructure Properties
- High-Energy Particle Collisions Research
- Microstructure and Mechanical Properties of Steels
- Particle accelerators and beam dynamics
- Advanced materials and composites
- Advanced ceramic materials synthesis
- High Temperature Alloys and Creep
- Powder Metallurgy Techniques and Materials
- Laser-Plasma Interactions and Diagnostics
- International Science and Diplomacy
- Diamond and Carbon-based Materials Research
- Metallic Glasses and Amorphous Alloys
- Advanced Materials Characterization Techniques
Max-Planck-Institut für Nachhaltige Materialien
2020-2024
University of Ottawa
2014-2022
European Organization for Nuclear Research
2016
Abstract Prediction of texture changes during cold rolling is important because they affect the recrystallization and anisotropy an aluminum sheet successive forming steps. During alloys, through-thickness textural change in subsurface layer depends heavily on shear stresses exerted material. The intensity this stress determined by value coefficient friction as contact length between rolls metallic changes. quality prediction under constant variable coefficients are assessed for three...
Abstract The influence of strain rate sensitivity on development Cube texture and the morphology Cube-oriented grains is often neglected in simulations approaches. Therefore, crystal plasticity experiments were performed up to 73 pct thickness reduction for cold rolling Al 6016. It found, that low values promote fragmentation avoid formation transition bands already at 50 55 reduction. High strain-rate cause leaving thin microstructure delay their fragmentation. Other components are affected...
In order to take up some challenges in metal forming coming from the recent environmental stakes, Electromagnetic Forming and Electro-Hydraulic processes have been developed at industrial scale, using advantages of high strain rates. Such progress has possible particular thanks emergence strongly coupled simulation tools. this article, examples selected applications deep forming, postforming, embossing, complex shapes forming. It shows how particular, increase formability can bring benefits...
Superconducting rf (SRF) cavities are traditionally fabricated from superconducting material sheets or made of copper coated with material, followed by trim machining and electron-beam welding. An alternative technique to traditional shaping methods, such as deep-drawing spinning, is electrohydraulic forming (EHF). In EHF, half-cells obtained through ultrahigh-speed deformation blank sheets, using shockwaves induced in water a pulsed electrical discharge. With respect highly dynamic process...
An investigation of the mechanical properties high-purity niobium single crystals is presented. Specimens were cut with different crystallographic orientations from a large grain disk and uniaxial tensile tests conducted at strain rates between 10-4 103 s-1. The logarithmic rate sensitivity for oriented close to center axis inverse pole figure (IPF) ~0.14 all rates. failure (ranging 0.4 0.9) very sensitive crystal orientation maximal ~10-2 s-1 an IPF. high anisotropy observed quasi-static...
Abstract The influence of an intermediate heat treatment at the end hot rolling and before cold on Cube texture formation during final solution annealing AA 6016 is investigated. Three bands with different initial grain sizes textures are considered: first one without rolling, while other two treated 540 °C for 1 hour in air being rolled. One heat-treated was left to cool down inside furnace. Electron-backscatter diffraction (EBSD) maps cold-rolled specimens crystal plasticity simulations...
Abstract The forming limit diagram (FLD) of high-purity niobium sheets used for the manufacturing superconducting radiofrequency (SRF) cavities is presented. Marciniak (in-plane) test was with blanks a thickness 1 mm and blank carriers annealed oxygen-free electronic (OFE) copper. A high formability measured, an approximate true major strain at necking plane 0.44. likely caused by its rate sensitivity 0.112. Plastic anisotropies (r-values) 1.66, 1.00, 2.30 were measured in 0 deg, 45 90 deg...
Abstract An investigation of the tensile mechanical properties electron beam welded OFE copper and high-purity niobium sheets is presented. Specimens were deformed in tension at strain rates ranging from 10 −3 to ~ 1600 s −1 . The 0.2% yield stress ultimate strength (UTS) specimens are similar those unwelded lower or equal 20 At higher rates, these for specimens. consistently than over range studied, while UTS comparable all rates. elongation failure remains unchanged ductility reduces...
Specimen manufacturing is one of the critical issues to solve during a dynamic material characterization, especially by mean Hopkinson bar technique. In particular, concerning tensile testing, sample generally axisymmetric with two threaded ends directly connect it bars. this context, work presents development an innovative geometry and related fixtures that can be widely adopted when conventional procedures are problematic or there numerous specimens. The Tensile Extruded Design Sample...