A5016636412- Titanium Alloys Microstructure and Properties
- Intermetallics and Advanced Alloy Properties
- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- Magnesium Alloys: Properties and Applications
- Advanced materials and composites
- Orthopaedic implants and arthroplasty
- MXene and MAX Phase Materials
- Rare-earth and actinide compounds
- Inorganic Chemistry and Materials
- Nuclear Materials and Properties
- Additive Manufacturing Materials and Processes
- Surface Treatment and Residual Stress
- Iron-based superconductors research
- Aluminum Alloys Composites Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Aluminum Alloy Microstructure Properties
- Thermodynamic and Structural Properties of Metals and Alloys
- Metallurgy and Material Forming
- Heusler alloys: electronic and magnetic properties
- Erosion and Abrasive Machining
- Advanced Welding Techniques Analysis
- Material Properties and Applications
- High-Velocity Impact and Material Behavior
- Crystallization and Solubility Studies
Charles University
2018-2023
Czech Academy of Sciences
2021
Czech Academy of Sciences, Institute of Physics
2021
Ti15Mo metastable beta Ti alloy was solution treated and subsequently deformed by high-pressure torsion (HPT). HPT-deformed benchmark non-deformed solution-treated materials were annealed at 400 °C 500 in order to investigate the effect of UFG microstructure on α-phase precipitation. Phase evolution examined using laboratory X-ray diffraction (XRD) high-energy synchrotron (HEXRD), which provided more accurate measurements. Microstructure observed scanning electron microscopy (SEM)...
Metastable β-Ti alloy Ti-15Mo was prepared by cryogenic ball milling in a slurry of liquid argon. Material remained ductile even at low temperatures, which suppressed particle refinement, but promoted intensive plastic deformation individual powder particles. Repetitive particles is similar to the multidirectional rolling and resembles bulk severe (SPD) methods. Initial milled powders were compacted spark plasma sintering. Sintered exhibited refined microstructure with small β-grains...
Ti15Mo alloy was subjected to two techniques of intensive plastic deformation, namely high pressure torsion and rotary swaging at room temperature. The imposed strain resulted in the formation an ultrafine-grained structure both deformed conditions. Detailed inspection microstructure revealed presence grains with a size around 100 nm after also contained elongated length up 1 µm. Isothermal ageing 400 °C 500 16 h applied conditions investigate kinetics precipitation α phase recovery lattice...
Ti15Mo alloy is a binary metastable beta titanium with excellent mechanical properties and biocompatibility.Therefore, it can potentially replace the most commonly used Ti6Al4V in biomedical applications.Further processing of by methods severe plastic deformation provides an opportunity to achieve exceptional grain refinement enhance properties.Another way how increase strength thermomechanical which leads formation α-phase.α-phase known precipitate heterogeneously, particular at...
Abstract A composite of powders semi-Heusler ferromagnetic shape memory and pure titanium was successfully prepared by spark plasma sintering at the temperature 950 °C. Sintering resulted in formation small precipitates intermetallic phases heterogeneous interfaces. Various complementary experimental methods were used to fully characterize microstructure. Imaging including transmission scanning electron microscopy with energy dispersive X-ray spectroscopy revealed a position chemical...
Metastable beta titanium alloys are perspective materials for use in biomedicine due to their excellent mechanical and physical properties, which can be improved by severe plastic deformation reducing grain size inserting a high degree of deformation.Ti-15Mo alloy was subjected 1-4 passes equal channel angular pressing die with channels intersecting at an angle 120 • the temperature 250 C. The microstructure observed means electron backscatter diffraction showed deformed highly twinned...
High strength and low elastic modulus are key properties of biomedical Ti-based alloys. Body centred cubic beta phase shows lowest modulus, especially if the stability is due to ‘proximity’ martensitic β α’’ transformation. It was previously shown that Ti-35Nb-6Ta-7Zr alloy contains biotolerant elements only exhibits modulus. By enriching this by 0.7 wt. % oxygen significantly enhanced, but increases as well. This fact can be attributed apparent stabilizing effect with respect In present...
A metastable β-titanium alloy, Ti15Mo was subjected to equal channel angular pressing (ECAP). The resulting microstructure of the material is inhomogeneous consisting micrometer size β-grains with deformed bands containing ultra-fine β-grains. ECAP-deformed sample thermal treatment in order elucidate difference morphology α-phase precipitation and non-deformed materials. formation accelerated areas higher concentration lattice defects. detail investigation by transmission electron microscopy...
Severe plastic deformation represented by three passes in Conform SPD and subsequent rotary swaging was applied on Ti grade 4. This process caused extreme strengthening of material, accompanied reduction ductility. Mechanical properties such material were then tuned a suitable heat treatment. Measurements situ electrical resistance, XRD hardness indicated the appropriate temperature to be 450 °C for treatment required obtain desired mechanical properties. The optimal duration annealing...
Metastable β-Ti alloys including Ti15Mo alloy are perspective candidates for use in medical applications. During thermal treatment undergoes various phase transformations. After solution it contains metastable β-phase and ω-phase. annealing the ω-phase partially dissolves as well stable α-phase particles formed. The treated was deformed by high pressure torsion (HPT) at room temperature. Significant grain refinement with size of ~100 nm achieved even after 1/4 HPT rotation. effect ultra-fine...
Revived interest for beta Ti alloys with increased oxygen content is motivated by the prospect of achieving material low modulus and high strength simultaneously. Fine tuning amount stabilizing elements critical good mechanical properties. This study shows that powder metallurgy method spark plasma sintering capable producing Ti-Nb-Zr-O from elemental powders. simple approach allows quick sampling production several various chemical composition. Elemental powders were mixed appropriate...
Phase transformations in a metastable beta Zr–12Nb alloy were investigated by high-energy X-ray diffraction (HEXRD) measured simultaneously with thermal expansion situ during linear heating from room temperature to 800 °C. Complementary in-situ methods of electrical resistance and differential scanning calorimetry, which performed using the same conditions as HEXRD experiment, provided additional information on transformation sequence occurring alloy. Two bcc phases different lattice...
Mg22Gd alloy was processed by high pressure torsion (HPT) at room temperature and the of 2 GPa. A series specimens with different number rotations N (N = 0-15) prepared from initial coarse grained as cast material. Mechanical properties were investigated microhardness mapping. The found to increase increasing strain imposed HPT tend saturate about HV 145. microstructure (phase morphology composition, etc.) evolution scanning electron microscopy EDS. High Gd content in resulted precipitation...
Ti-15Mo alloy belongs to metastable β-Ti alloys that are currently used in aircraft manufacturing and Ti15Mo is a perspective candidate for the use medicine thanks its biotolerant composition. In this study, was prepared by advanced techniques of powder metallurgy. The gas atomized subjected cryogenic milling achieve ultra-fine grained microstructure within particles. Powder subsequently compacted using spark plasma sintering (SPS). effect on phase composition final bulk material after SPS...