Sergey Zherebtsov
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Excellent Strength–Impact Toughness Combination of Heterostructured Metastable Fe-Rich Medium-Entropy Alloy Open
The effect of a heterogeneous structure obtained via cold rotary swaging (CRS) and post-deformation annealing (PDA) on the dynamic mechanical properties of a non-equiatomic 49.5Fe-30Mn-10Co-10Cr-0.5C (at.%) medium-entropy alloy at room and…
Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition Open
The temperature dependence of the mechanical properties of the CoCrFeNi medium-entropy alloy (MEA) manufactured by laser-directed energy deposition (L-DED) and additionally annealed at 1200 °C for 24 h was studied. The microstructure of th…
Cracking Behaviour of René 80-Type Superalloy During Laser-Based Directed Energy Deposition Open
Features of microstructure, mechanical properties, and cracking behaviour of the René 80-type superalloy manufactured by laser-based directed energy deposition (DED-LB) have been investigated. Different cracking behaviours were observed in…
Microstructure Evolution and Mechanical Behavior of TiB-Reinforced Ti-6.5Al-2Zr-1Mo-1V Matrix Composites Obtained by Vacuum Arc Melting and Spark Plasma Sintering Open
Ti-6.5Al-2Zr-1Mo-1V/TiB metal matrix composites with 3 wt.% of TiB2 were obtained using vacuum arc melting and spark plasma sintering methods and compared with an unreinforced Ti-6.5Al-2Zr-1Mo-1V alloy. The microstructures of the unreinfor…
Microstructure and mechanical properties OF Ti-6.5Al-2Zr-1Mo-1V/TiB composites produced by various methods Open
Ti-6.5Al-2Zr-1Mo-1V/TiB composites were obtained by vacuum-arc melting, selective laser melting and spark plasma sintering. The weight percentage of TiB2 in the initial charge was 0.7 and 2.0 wt.%; samples of unreinforced Ti-6.5Al-2Zr-1Mo-…
The Influence of Absorbing Coating Material on the Efficiency of Laser Shock Peening Open
Laser shock peening (LSP) is a relatively novel and promising surface hardening method. An absorbing layer, which is needed to protect the specimen surface from undesirable thermal effects caused by laser irradiation, should be considered …
Cracking Behavior of the ZhS6K Superalloy during Direct Laser Deposition with Induction Heating Open
For this work, the behavior of the ZhS6K alloy (Russian grade) in the process of direct laser deposition was investigated. Two samples, a “small” one (40 × 10 × 10 mm3) and “large” one (80 × 16 × 16 mm3), were fabricated with direct laser …
Effect of Cold Rolling on Microstructure and Mechanical Properties of a Cast TiNbZr-Based Composite Reinforced with Borides Open
The TiNbZr/(Ti, Nb)B metal matrix composite with 2.5 vol.% of borides was produced by vacuum arc melting. The composite was then cold-rolled to thickness strains of 10, 20, 50, or 80%. In the initial condition, the composite had a network-…
Deformation Behavior and Microstructure Evolution of a TiB-Reinforced Ti-6.5Al-2Zr-1Mo-1V Matrix Composite Open
A Ti-6.5Al-2Zr-1Mo-1V/TiB metal-matrix composite with 10.0 vol.% of TiB reinforcing fibers was produced using vacuum arc melting and compared with an unreinforced arc-melted Ti-6.5Al-2Zr-1Mo-1V alloy. The initial microstructure of the comp…
Oxidation Behaviour of Refractory (HfCo)100−x(NbMo)x High-Entropy Alloys with a bcc+B2 Structure Open
Herein, the oxidation behaviour of refractory (HfCo)100−x(NbMo)x (x = 0; 10; 25; 40; 75; 100 (at.%)) high-entropy alloys with a bcc+B2 structure subjected to cyclic oxidation at 1000 °C was studied. The single-phase B2-ordered HfCo alloy d…
View article: On the Degree of Plastic Strain during Laser Shock Peening of Ti-6Al-4V
On the Degree of Plastic Strain during Laser Shock Peening of Ti-6Al-4V Open
Laser shock peening (LSP) is an innovative technique that is used to enhance the fatigue strength of structural materials via the generation of significant residual stress. The present work was undertaken to evaluate the degree of plastic …
Prediction and Experimental Evaluation of Mechanical Properties of SiC-Reinforced Ti-4.25Al-2V Matrix Composites Produced by Laser Direct Energy Deposition Open
An important direction in the development of additive technologies is associated with the addition of ceramic particles (oxide, carbide, boride, and nitride ceramics) to metal powders. The prediction of the physical and mechanical characte…
Thermal stability of (HfCo)90(NbMo)10 and (HfCo)75(NbMo)25 refractory high entropy alloys with a bcc + B2 structure Open
The effect of long-term (700 h) annealing at 1000 °С on the structure and mechanical properties of the as-cast (HfCo)90(NbMo)10 and (HfCo)75(NbMo)25 (in at.%) refractory high entropy alloys was examined. The as-cast alloys consisted of a m…
Structure and mechanical properties of welded joints from alloy based on VTI-4 orthorhombic titanium aluminide produced by pulse laser welding Open
Ti 2 AlNb-based alloys are promising materials for operation at high temperatures in aerospace industry. Meanwhile, the existing difficulties of weldability restrict opportunities of their application. This work is devoted to studies of we…
Tuning the grain and domain sizes to achieve superior room-temperature tensile ductility in a B2-ordered refractory Al15Nb40Ti40V5 medium-entropy alloy Open
Authors showed that the grain size, rather than the domain size, controlled room-temperature properties of a B2-ordered refractory Al₁₅Nb₄₀Ti₄₀V₅ medium-entropy alloy. Grain refinement to 20 μm at any size of B2 domains resulted in elongat…
Mechanical Behavior of a Medium-Entropy Fe65(CoNi)25Cr9.5C0.5 Alloy Produced by Selective Laser Melting Open
Specimens of a medium-entropy Fe65(CoNi)25Cr9.5C0.5 (in at.%) alloy were produced using additive manufacturing (selective laser melting, SLM). The selected parameters of SLM resulted in a very high density in the specimens with a residual …
Gradient Microstructure and Texture Formation in a Metastable Austenitic Stainless Steel during Cold Rotary Swaging Open
The paper aimed to study the evolution of the microstructure and texture gradient of a 321-type metastable austenitic stainless steel during cold rotary swaging. Cold rotary swaging was carried out with a reduction of up to 90% at ambient …
Microstructure and Mechanical Properties of Biomedical Ti-Zr-Nb-Ta-Sn High-Entropy Alloys Open
Ti(50-x)Zr38NbxTa8Sn4 high-entropy alloys with x = 0, 10, and 20 at.% were produced by vacuum arc melting in a high-purity argon atmosphere. The initial microstructures consisted of equiaxial bcc grains with sizes of 115 ± 30 µm, 250 ± 60 …
STRENGTHENING MECHANISMS OF A TI/TIB COMPOSITE PRODUCED BY SPARK PLASMA SINTERING AFTER HOT ROLLING Open
The Ti/TiB metal-matrix composite was obtained by spark plasma sintering at a temperature of 1000 °C. In the initial state, the Ti/TiB MMC microstructure consisted of TiB needle fibers unevenly distributed in the titanium matrix. SEM showe…
Effect of B2 ordering on the tensile mechanical properties of refractory AlxNb40Ti40V20−x medium-entropy alloys Open
This work demonstrated that the effect of the B2 ordering on the mechanical properties of new refractory materials under tension of alloys with average entropy AlxNb₄₀Ti₄₀V₂₀-x (x = 0; 15; 20 at.%) were diverse and depended on the chemical…
Effect of Nitrogen Doping on the Structure and Mechanical Properties of the Fe40Mn40Cr10Co10 High-Entropy Alloy Open
The structure and mechanical properties of as-cast and thermomechanicaly processed (cold rolling followed by annealing at 700 °C and 900 °C) Fe40Mn40Cr10Co10 (at.%) high-entropy alloys doped with different amounts (0, 0.5, and 2.0 at.%) of…
Overcoming the strength-ductility trade-off in refractory medium-entropy alloys via controlled B2 ordering Open
Herein, we showed that controlled additions of Al, which provided a certain degree of B2 ordering, resulted in a ∼ 37%-enhancement of both yield strength and uniform elongation in Alx(NbTiZr)100-x (x = 0; 2.5; 5; 7.5 at.%) refractory mediu…
Design of High-Entropy Alloys Open
High-entropy alloys (HEAs) and related complex, concentrated alloys (CCAs) have resulted from new approaches to alloy design, which emerged 18 years ago [...]
Structure and Properties of High-Entropy Nitride Coatings Open
The interest in nitride coatings based on high-entropy alloys (HEAs) has increased rapidly in the last decade. According to a number of papers, such high-entropy nitride (HEN) coatings have a single-phase structure and properties that sign…
Strong-field physics with nanospheres Open
When intense laser fields interact with nanoscale targets, strong-field physics meets plasmonic near-field enhancement and subwavelength localization of light. Photoemission spectra reflect the associated attosecond optical and electronic …
Few-femtosecond resolved imaging of laser-driven nanoplasma expansion Open
The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The significance of the associated spatiotemporal plasma motion ranges…