Hierarchical microstructures enabled excellent low-temperature strength-ductility synergy in bulk pure tungsten

Xie, Xuefeng; Xie, Zhouqing; Liu, R.; Fang, Q.F.; Liu, C.S.; Han, Wei; Wu, Xue-Bing

doi:10.1016/j.actamat.2022.117765

Cited by 75 publications

(4 citation statements)

References 99 publications

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“…This could be attributed to the presence of dissolved light elements (such as C and O) within the lattice or at grain boundaries [15a, 19] , along with the roughness of grain boundaries caused by grain growth and interlocking upon reduction [20] . Furthermore, the substantial presence of dislocations in the fabricated tungsten also contributed to the enhancement of its properties [21] . https://doi.org/10.26434/chemrxiv-2024-pqzct ORCID: https://orcid.org/0000-0003-4879-9248 Content not peer-reviewed by ChemRxiv.…”

Section: Resultsmentioning

confidence: 98%

Fabrication of High-Density Microarchitected Tungsten via DLP 3D Printing

Cai,

Ma,

et al. 2024

Preprint

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Current additive manufacturing (AM) techniques for tungsten, such as powder bed fusion and directed energy deposition, often generate parts with rough surfaces. Vat photopolymerization presents a promising alternative for fabricating intricate tungsten structures with high shape fidelity and low surface roughness. However, existing vat photopolymerization approaches suffer from surface defects and low final density, leading to compromised mechanical properties. Therefore, achieving high-density tungsten structures using vat photopolymerization remains a crucial challenge. This work presents a straightforward and reliable method for fabricating complex, micro-architected tungsten structures with superior density and hardness. The approach utilizes a water-based photoresin with exceptional tungsten ion loading capacity. The photoresin is then patterned using digital light processing (DLP) to create intricate tungsten-laden precursors. A meticulously designed three-step debinding and sintering process subsequently achieves three-dimensional tungsten structures with dense surface morphology and minimal internal defects. The microstructures achieve a minimum feature size of 35 μm, a low surface roughness of 2.86 μm, and demonstrate exceptional mechanical properties. This new method for structuring tungsten opens doors to a broad range of applications, including micromachining, collimators, detectors, and metamaterials.

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Section: Resultsmentioning

confidence: 98%

Fabrication of High-Density Microarchitected Tungsten via DLP 3D Printing

Cai,

Ma,

et al. 2024

Preprint

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“…При цьому домішки розподіляються по більшій питомій поверхні в результаті чого товщина їх плівок зменшується, а відповідно і знижується їх окрихчувальна дія. Так в роботі [13] повідомляється, що поєднання низькотемпературної пластичності та високої міцності в об'ємному чистому W можливо отримати застосуванням високоенергетичної обробки куванням. Пояснено це тим, що в структурі вольфраму утворюються пластинчасті видовжені матричні зерна, з численними внутрішніми дрібними субзернами та високою щільністю рухомих крайових і змішаних дислокацій.…”

Section: аналіз досліджень та публікаційunclassified

Study of the Possibility of Increasing the Plasticity of Tungsten Wire at Normal Temperatures by Optimizing the Drawing Technology

Vinichenko,

Yershov,

Ol'shanetskii

et al. 2023

НМТ

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Purpose. The development of a mathematical model for the process of drawing a tungsten-thorium wire for the analysis of the influence of technological factors of the specified process on the plasticity of the material and the recommendations on how to choose their optimal values, from the point of view reaching the plasticity of the wire at the maximum productivity of the wire drawing process. Research methods. The problem of creating a mathematical model for investigating the influnce of technological parameters into the process of drawing on the plasticity of a tungsten-thorium rod was considered to be based on the theory of experiment, in particular the method of experiment planning. Various material samples were prepared using methods of powder metallurgy and pressure treatment, in particular wire drawing. Experiments were carried out in real production conditions using industrial equipment. The plasticity of the tungsten-thorium rod was determined by torsion testing using the K-5 machine. Results. A mathematical model has been created that adequately describes the impact of technological factors on the plasticity of tungsten wire, which allows thoroughly analyze the physical processes that occur during wire drawing, and, if necessary, correct regimes without conducting a large number of physical experiments. Scientific novelty. The mathematical model has been proposed as it allows to analyze the impact of technological factors of drawing process on plasticity of tungsten-thorium wire produced at real manufacturing. Practical value. It can be useful for the technologists for higher productive application of industrial equipment and decrease of expenses for production of experiment consignment.

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“…However, as a metal with a body-centered cubic (BCC) structure and because of its electronic structure, characteristics of inter atomic bonds and lattice resistance of dislocation stress field, pure tungsten materials have inherent brittleness at lower temperatures (high ductile-to-brittle transition temperature, DBTT) [7,8], brittleness caused by recrystallization [9] and neutron irradiation when used as PFMs [10]. In the past, researchers prepared various new tungsten-based materials with significantly improved mechanical properties through doping [11], alloying [12,13] or microstructural modification methods [14]. However, in harsh service environments where high-energy neutrons, plasma and high thermal loads coexist in fusion reactors, the performance of these new materials has not been fully sufficient [15].…”

Section: Introductionmentioning

confidence: 99%

The Microstructural and Hardness Changes of Tungsten Fiber after Au2+ Irradiation

et al. 2023

Crystals

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Tungsten fiber-reinforced tungsten composite (Wf/W) material is considered a plasma-facing material (PFM) with good application prospects. Commercial tungsten wire (fiber) prepared through forging and drawing processes has excellent mechanical properties, as well as a very high recrystallization temperature due to the unique texture of it grain structure. Commercial tungsten fiber is the most proper reinforcement for Wf/W. The change in the properties of tungsten fiber because of neutron irradiation makes it inevitable for Wf/W to be used as PFMs. However, there is very little research on the change in the properties of tungsten fiber caused by neutron irradiation. In this work, we used heavy ion irradiation to simulate the displacement damage generated by neutron irradiation to explore the alteration of the properties of a commercial tungsten fiber caused by neutron irradiation. The investigated subject was tungsten fiber with a diameter of 300 μm. The irradiation source was 7.5 MeV Au2+, which generated a maximum displacement damage of 60 dpa at a depth of 400 nm, and the irradiation influenced depth was 1000 nm. Because of the irradiation, significant lattice distortion occurred within the tungsten fiber, resulting in the transition from (110) texture to (100) texture at the fiber’s cross-section. The results of the Schmidt factor and Taylor factor analysis indicate a decrease in the plasticity of the tungsten fiber after irradiation, but it did not completely lose its plasticity. The results of the nanoindentation test confirmed the radiation hardening. After irradiation, the hardness of the tungsten fiber increased by approximately 0.33 GPa, but this increase was relatively small compared to other tungsten-based materials. This indicates that commercial tungsten fiber is a low-cost and highly reliable reinforcement material for Wf/W composite materials.

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Hierarchical microstructures enabled excellent low-temperature strength-ductility synergy in bulk pure tungsten

Cited by 75 publications

References 99 publications

Fabrication of High-Density Microarchitected Tungsten via DLP 3D Printing

Fabrication of High-Density Microarchitected Tungsten via DLP 3D Printing

Study of the Possibility of Increasing the Plasticity of Tungsten Wire at Normal Temperatures by Optimizing the Drawing Technology

The Microstructural and Hardness Changes of Tungsten Fiber after Au2+ Irradiation

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