A5022436509- Titanium Alloys Microstructure and Properties
- Advanced materials and composites
- Intermetallics and Advanced Alloy Properties
- Orthopaedic implants and arthroplasty
- High Entropy Alloys Studies
- Metal and Thin Film Mechanics
- Additive Manufacturing Materials and Processes
- Aluminum Alloys Composites Properties
- Nuclear Materials and Properties
- High-Temperature Coating Behaviors
- Microstructure and mechanical properties
- Fusion materials and technologies
- Aluminum Alloy Microstructure Properties
- Metallurgy and Material Forming
- Hydrogen embrittlement and corrosion behaviors in metals
- Bone Tissue Engineering Materials
- Thallium and Germanium Studies
- Bauxite Residue and Utilization
- Welding Techniques and Residual Stresses
- Metal Forming Simulation Techniques
- Microstructure and Mechanical Properties of Steels
Charles University
2018-2024
Controlled mechanical loading was applied to Ti-15Mo alloy during annealing at 550 {\deg}C. Massive formation of the $\omega_{\textrm{iso}}$ phase from parent $\beta$-phase occurred {\deg}C without external stress or with well below yield stress. Moreover, a massive $\alpha$ precipitation takes place under simultaneous and plastic deformation. Plastic deformation plays key role in $\beta\rightarrow\alpha$ transformation achieving refined $\alpha+\beta$ type microstructure resulted improved...
Compositionally graded Ti(4–12 wt% Mo) alloys were successfully prepared by laser directed energy deposition (L-DED) using two hoppers from Ti and Ti-15Mo master alloy powders. Detailed SEM, EDS XRD analysis reveals the variation of microstructure consequently explains evolution microhardness with Mo concentration. High power is required to dissolve particles, improve homogeneity material at scale particle size, achieve a smooth linear gradient chemical composition. In bottom part samples,...
Abstract The field-assisted sintering technique (FAST) was successfully used to sinter, homogenize, and age the Ti–5Al–5V–5Mo–3Cr (Ti-5553) aerospace alloy from blended elemental powders in a single processing run. Sintering at comparatively high temperature of 1500 °C assured chemical homogeneity material. Subsequently, without cooling room temperature, lowered 600 for 30 min provide annealing treatment produce desired lamellar α + β microstructure. Using an in-house designed assembly,...
A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type aluminum alloy is susceptible to the depletion surface layers Li. Therefore, choosing a suitable temperature and duration crucial step in assuring homogeneous distribution alloying elements optimal exploitation potential alloy. In-situ heating an electron microscope was performed on twin-roll cast understand peculiarities process. Four types primary...
A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type aluminum alloy is susceptible to the depletion surface layers Li. Therefore, choosing a suitable temperature and duration crucial step in assuring homogeneous distribution alloying elements optimal exploitation potential alloy. In situ heating an electron microscope was performed on twin-roll-cast understand peculiarities process. Four types primary...
Biomedical metastable alloy Ti-xNb-7Zr-0.8O with a compositional gradient of Nb was prepared from elemental powders by field-assisted sintering technique (FAST). The aim to investigate phase transformations over wide range compositions, facilitating the designing biomedical Ti alloys. Scanning Electron Microscopy (SEM) and Transmission (TEM) investigations revealed that Nb-rich regions retained β phase, surrounded transition region consisting ω phases, while Nb-lean consisted α phases....
In the present work, a series of high-entropy alloys based on refractory metals Hf, Nb, Ta, Ti, V, and Zr with various compositions have been systematically investigated. Our study revealed that bcc single-phase solid solution Hf-Nb-Ta-Ti-V-Zr system is thermodynamically stable only at high temperatures above 1000 °C. At lower temperatures, phase separation into disordered phases slightly different chemical occurs. Despite separation, random can be saved room temperature as metastable by...
Ti-8.5Mo (wt%) alloy was prepared by laser directed energy deposition (L-DED) from the mixture of cp-Ti and Ti-15Mo powder in ratio 50:50 using constant power 600 W. Microstructure as-printed material characterized microhardness mapping, light scanning electron microscopy employing EDS technique local X-ray diffraction measurements. In particular, influence baseplate preheating to 500 °C on microstructure evolution determined. The as-deposited samples consists columnar grains orientated...
Tungsten-based materials are the prime candidate plasma-facing for future fusion reactors, such as DEMO. Spark plasma sintering is a prospective fabrication technology with several advantageous features. The concurrent application of electric current, temperature and pressure enhances process, allowing lower temperatures shorter times than traditional powder metallurgy processes. This in turn helps to avoid excessive grain growth phase segregation W-alloys. study focused on factors that may...
Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of stem hip joint replacement. This contains only biocompatible elements and possesses very high yield strength already in cast condition (900 MPa). However, porosity, large grain size chemical inhomogeneity reduce fatigue performance below limits required utilization desired application. Two methods hot working, die forging rolling, were used processing this alloy. Microstructural...
High strength and low Young’s modulus is the desired combination of mechanical properties for endoprostheses material. Metastable beta titanium alloys are promising materials this application. In study, four Ti-xNb-6Ta-7Zr-0.7O (wt.%) were prepared where Nb content ranged from 26 to 35 wt. %. All contained pure phase. The high oxygen causes microhardness (330 HV), hence also strength, while decreasing leads lower electrons per atom (e/a) ratio. e/a ratio affects which highest (76 GPa) in...
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...
Low-alloyed zirconium alloys are widely used in nuclear applications due to their low neutron absorption cross-section. These alloys, however, suffer from limited strength. Well-established guidelines for the development of Ti were applied design new two-phase ternary Zr with improved mechanical properties. Zr-4Sn-4Nb and Zr-8Sn-4Nb have been manufactured by vacuum arc melting, thermo-mechanically processed annealing, forging, aging various microstructural conditions thoroughly...
Near-beta titanium alloys have shown low Young's modulus and good strength, making them excellent implant candidates. However, their processing using thermomechanical routes in single phase beta region results heterogeneous microstructures due to high content alloying elements consequent slow diffusion-controlled processes such as dynamic recovery. This study investigates the deformation behaviour of a Ti-15Mo alloy through hot compression experiments Gleeble 3800 device domain at strain...