Enhanced strength and ductility of nano-grained titanium processed by two-step severe plastic deformation

Hong-fei, Wang; Ban, Chunyan; Zhao, Nannan; Kang, Yiyao; Qin, Tipeng; Liu, Sitong; Chen, Jianzhong

doi:10.1016/j.matlet.2020.127485

Cited by 15 publications

(4 citation statements)

References 16 publications

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“…To use our model to accurately investigate the transport properties of solid oxide fuel cell materials such as YSZ, the model must be extended to three dimensions. The generalization of equations ( 6) and (7) gives…”

Section: Case Study 1-solid Oxide Fuel Cellmentioning

confidence: 99%

“…The unique configurations of atoms at grain boundaries, in which bonding structures differ from atoms in the intrinsic lattice, lead to differences in mechanical and/or transport behavior between grain boundaries and bulk regions. In many cases, materials can be designed to take advantage of these grain boundary effects [1], such as improving corrosion resistance [2,3], creep strength [3,4], ductility [5,6], and damage resistance [3,7,8] in metallic alloys. Grain boundaries have also been shown to increase transport rates of charge-carrying species in photovoltaics [9][10][11] and battery materials [12,13] as well as enhancing dopant diffusion rates in polycrystalline silicon [14].…”

Section: Introductionmentioning

confidence: 99%

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Simulating hindered grain boundary diffusion using the smoothed boundary method

Hanson,

Andrews,

Powers

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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Grain boundaries can greatly affect the transport properties of polycrystalline materials, particularly when the grain size approaches the nanoscale. While grain boundaries often enhance diffusion by providing a fast pathway for chemical transport, some material systems, such as those of solid oxide fuel cells and battery cathode particles, exhibit the opposite behavior, where grain boundaries act to hinder diffusion. To facilitate the study of systems with hindered grain boundary diffusion, we propose a model that utilizes the Smoothed Boundary Method (SBM) to simulate the dynamic concentration evolution in polycrystalline systems. The model employs domain parameters with diffuse interfaces to describe the grains, thereby enabling solutions with explicit consideration of their complex geometries. The intrinsic error arising from the diffuse interface approach employed in our proposed model is explored by comparing the results against a sharp interface model for a variety of parameter sets. Finally, two case studies are considered to demonstrate potential applications of the model. First, a nanocrystalline yttria-stabilized zirconia solid oxide fuel cell system is investigated, and the effective diffusivities are extracted from the simulation results and are compared to the values obtained through mean-field approximations. Second, the concentration evolution during lithiation of a polycrystalline battery cathode particle is simulated to demonstrate the method’s capability.

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Section: Case Study 1-solid Oxide Fuel Cellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulating hindered grain boundary diffusion using the smoothed boundary method

Hanson,

Andrews,

Powers

et al. 2024

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

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“…Research has been performed to reveal the relationship between the rheological properties and microstructure of titanium alloys in high-temperature deformation [8][9][10][11]. Cui et al [8] presented a constitutive model of TC11 based on the Arrhenius-type hyperbolic sine method by the cubic piecewise function of strain which ensured the high precision of the model.…”

Section: Introductionmentioning

confidence: 99%

“…Davis et al [10] analyzed how the process parameters affect the β-phase recrystallization level and the final grain size by controlling the specimen deformation and heating rate. In addition, some researchers have achieved excellent microstructure and mechanical properties through multiple deformations [11,12] and proposed effective step-by-step forming methods to refine the grains of titanium alloys and increase the strength of titanium alloys [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Strain on Microstructure and Tensile Properties of Ti-6Al-4V at Elevated Temperature

Wang

Chen

et al. 2021

Metals

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Research on pre-deformation influences on material properties in multistep hot forming is of important scientific interest. In this paper, hot tensile tests at 850 °C and a strain rate of 0.001 s−1 were performed to study the microstructural evolution and mechanical properties of Ti-6Al-4V with pre-strains at 0.05, 0.1 and 0.15. The tensile test results showed that the specimen with 0.05 pre-strain exhibited higher flow stress and larger elongation. Additionally, increasing the pre-strain resulted in a decrease in ultimate tensile strength (UTS) and elongation (EL). The EBSD results showed that the main deformation mechanism of Ti-6Al-4V was high-angle grain boundary sliding. Pre-strain promoted dynamic recrystallization (DRX) by increasing the deformation substructure. The refinement of grains and the eradication of dislocations enhanced the deformability, resulting in an increase in flow stress.

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Structural and mechanical evaluation of a new Ti-Nb-Mo alloy produced by high-energy ball milling with variable milling time for biomedical applications

Dahmani,

Fellah,

Hezil

et al. 2023

Int J Adv Manuf Technol

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The main focus of this work is to investigate the impact of varying milling times (2 to 18 h) on the structural and mechanical properties of the developed Ti-Nb-Mo alloy. The morphology, phase composition, microstructure, and mechanical behavior of milled and sintered Ti-25Nb-25Mo alloy samples were characterized systematically using x-ray diffraction, scanning electron microscope, optical microscope, and Vicker microhardness. It was noted that the quantity of the β-Ti phase increased as the milling time increased. After 12 h of milling, the synthesized alloys exhibited a spherical morphology and texture with homogeneous distribution. The milled alloys' structural evolution and morphological changes were found to be dependent on their milling duration. Morphological analysis revealed that the crystallite size and mean pore size decreased when the milling duration increased, reaching minimum values of 51 nm and < 1 μm, after 12 and 18 h respectively. As the milling time increased, the grain size decreased, resulting in an increase in density, microhardness, and elastic modulus. Ti-25Nb-25Mo will presents good anti-wear ability and higher resistance to plastic deformation due to enhanced mechanical characteristics (H/E, and H3/E2). Hence, the developed Ti-25Nb-25Mo alloys with reduced elastic modulus and desirable mechanical properties were found to be a promising option for biomedical applications.

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Enhanced strength and ductility of nano-grained titanium processed by two-step severe plastic deformation

Cited by 15 publications

References 16 publications

Simulating hindered grain boundary diffusion using the smoothed boundary method

Simulating hindered grain boundary diffusion using the smoothed boundary method

Effect of Pre-Strain on Microstructure and Tensile Properties of Ti-6Al-4V at Elevated Temperature

Structural and mechanical evaluation of a new Ti-Nb-Mo alloy produced by high-energy ball milling with variable milling time for biomedical applications

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