Effect of Structure and Hydrogen on the Short-Term Creep of Titanium Ti-2.9Al-4.5V-4.8Mo Alloy

Grabovetskaya, G. P.; Мишин, И. П.; Stepanova, E. N.; Забудченко, О. В.

doi:10.3390/ma15113905

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…From a practical perspective, the formation of an ultrafine-grained structure will ensure enhanced strength properties, an increase in fatigue life, and design reliability. On the other hand, it is known that ultrafine-grained and nanostructured materials often exhibit reduced creep resistance due to high internal energy and a non-equilibrium state of boundaries [38].…”

Section: Discussionmentioning

confidence: 99%

Microstructure of the Advanced Titanium Alloy VT8M-1 Subjected to Rotary Swaging

Dyakonov,

Yakovleva,

Mironov

et al. 2023

Materials

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In this study, the microstructural behavior of the advanced Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn-0.15Si (VT8M-1) alloy during rotary swaging (RS) was investigated. VT8M-1 has increased heat resistance and is considered a replacement for the Ti-6Al-4V alloy. It was shown that, during RS, the evolution of the primary a phase is characterized by the formation of predominantly low-angle boundaries according to the mechanism of continuous dynamic recrystallization. The density of low-angle boundaries increases three times: from 0.38 µm−1 to 1.21 µm−1 after RS. The process of spheroidization of the lamellar (a + b) component is incomplete. The average size of globular a and b particles was 0.3 μm (TEM). It is shown that the microstructures after RS (ε = 1.56) and equal-channel angular pressing (ECAP) (ε = 1.4) are significantly different. The temperature–velocity regime and the predominance of shear deformations during ECAP contributed to a noticeable refinement of the primary a-phase and a more complete development of globularization of the lamellar (a+b) component. EBSD studies have shown that RS leads to the formation of a structure with a higher density of low- and high-angle boundaries compared to the structure after ECAP. The results are useful for predicting alloy microstructure in the production of long rods that are further used in forging operations.

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Section: Discussionmentioning

confidence: 99%

Microstructure of the Advanced Titanium Alloy VT8M-1 Subjected to Rotary Swaging

Dyakonov,

Yakovleva,

Mironov

et al. 2023

Materials

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“…Apart from vacancy defects, H impurities can also lead to the degradation of materials, such as hydrogen embrittlement [ 32 ] and facilitated crack propagation by H diffusion [ 33 ]. Besides, the interaction between H atoms and uranium materials has long been a concern.…”

Section: Introductionmentioning

confidence: 99%

Point Defects Stability, Hydrogen Diffusion, Electronic Structure, and Mechanical Properties of Defected Equiatomic γ(U,Zr) from First-Principles

Huang

Ma²,

Lai³

et al. 2022

Materials

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At present, many experimental fast reactors have adopted alloy nuclear fuels, for example, U-Zr alloy fuels. During the neutron irradiation process, vacancies and hydrogen (H) impurity atoms can both exist in U-Zr alloy fuels. Here, first-principles density functional theory (DFT) is employed to study the behaviors of vacancies and H atoms in disordered-γ(U,Zr) as well as their impacts on the electronic structure and mechanical properties. The formation energy of vacancies and hydrogen solution energy are calculated. The effect of vacancies on the migration barrier of hydrogen atoms is revealed. The effect of vacancies and hydrogen atom on densities of states and elastic constants are also presented. The results illustrate that U vacancy is easier to be formed than Zr vacancy. The H interstitial prefers the tetrahedral site. Besides, U vacancy shows H-trap ability and can raise the H migration barrier. Almost all the defects lead to decreases in electrical conductivity and bulk modulus. It is also found that the main effect of defects is on the U-5f orbitals. This work provides a theoretical understanding of the effect of defects on the electronic and mechanical properties of U-Zr alloys, which is an essential step toward tailoring their performance.

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Effect of Hydrogen on the Development of Deformation and Fracture in Titanium Alloy VT22 in the Temperature Range of 293–823 K

Grabovetskaya,

Mishin,

Naydenkin

et al. 2024

Russ Phys J

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Effect of Structure and Hydrogen on the Short-Term Creep of Titanium Ti-2.9Al-4.5V-4.8Mo Alloy

Cited by 4 publications

References 51 publications

Microstructure of the Advanced Titanium Alloy VT8M-1 Subjected to Rotary Swaging

Microstructure of the Advanced Titanium Alloy VT8M-1 Subjected to Rotary Swaging

Point Defects Stability, Hydrogen Diffusion, Electronic Structure, and Mechanical Properties of Defected Equiatomic γ(U,Zr) from First-Principles

Effect of Hydrogen on the Development of Deformation and Fracture in Titanium Alloy VT22 in the Temperature Range of 293–823 K

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