Effects of tantalum concentration on the microstructures and mechanical properties of tungsten-tantalum alloys

Measuring the fracture behavior of small specimens of semibrittle materials such as tungsten is often difficult due to the lack of crack stability and a high ratio of the crack tip plastic zone size to specimen dimensions. To overcome this, microcantilever bending tests were used with a stable chevron notch geometry coupled with elastic-plastic fracture mechanical (EPFM) analysis. The chevron notch geometry was first validated by measurement of the ð111Þ cleavage toughness in single-crystal Si, then fracture resistance curves (Rcurves) were calculated via EPFM analysis of fracture data obtained from a semibrittle W-1%Ta alloy. The accuracy of the fracture resistance curves measured from W-1%Ta was evaluated by means of ASTM standard macroscopic fracture tests. The conditional fracture toughness (K Qc) prior to crack instability was found to be five times larger than the macroscopic fracture toughness (K Ic), due to the combination of plastic tearing of ductile ligaments and the extensive microplasticity ahead of the crack tip. These results suggest that use of chevron-notched microcantilevers is suitable for evaluating the fracture toughness of brittle silicon but overestimates the fracture toughness value for semibrittle tungsten.

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“…The higher r ys in W-1%Ta can be attributed to the strengthening effect from the tantalum addition. 33…”

Section: Triangular Microcantileversmentioning

confidence: 99%

Evaluation of Fracture Toughness Measurements Using Chevron-Notched Silicon and Tungsten Microcantilevers

Marrow

Roberts

et al. 2019

JOM

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“…The addition of alloying elements or second-phase particles is an effective approach to improve the toughness of W materials [10]. Mechanical milling is usually applied for the preparation of W alloy powders with doping alloying elements of Re [28], Ta [29], V [30], etc. During the milling process, the kinetic energy of milling balls will be transferred into the powders, resulting in the powders being mixed, deformed and heated.…”

Section: Powder Preparation Techniquesmentioning

confidence: 99%

Manufacturing of tungsten and tungsten composites for fusion application via different routes

2019

Tungsten

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Tungsten is a refractory metal with the highest melting point of all metals, which is considered as a promising candidate material for plasma-facing materials in the future fusion reactor. However, tungsten faces several challenges from intrinsic embrittlement, irradiation embrittlement and recrystallization embrittlement during the operation of the fusion reactor. To satisfy the fusion engineering application, an advanced tungsten material with the fine grain and dense microstructure is required and developed. This paper briefly introduces the application background of the tungsten materials and mainly illustrates a series of common techniques for manufacturing advance tungsten materials, such as powder preparation technologies, bulk densification techniques, continuous processing technologies and the coating and additive manufacturing technologies. Furthermore, the development prospects for manufacturing techniques of tungsten materials are also presented in the end. Considering the tungsten materials employed in the fusion engineering application, combining these scalable techniques of the wet-chemical method, pressureless sintering and continuous deformation processing techniques would be the possible research and development routes to realize the manufacture of the advanced tungsten materials.

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“…As a refractory transition metal with extremely high melting point, tungsten has been considered to be primary candidate for the plasma facing materials (PFMs) in the future fusion reactor [1]. Recently, many efforts have been done to fabricate tungsten-based materials with desired properties for advanced fission and fusion application by doping alloy elements [2][3][4][5][6] or dispersoid strengthening [7][8][9][10]. Tungsten-based PFMs will be directly exposed to 10-10 4 MeV plasma and 14.1 MeV neutron radiation in the fusion reactor [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Recent progress of radiation response in nanostructured tungsten for nuclear application

Pei

et al. 2021

Tungsten

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Engineering materials for nuclear reactors exposed to high-dose irradiation breed various radiation damage, leading to performance degradation of materials, which seriously limits the application of materials in the future advanced nuclear reactors. Tungsten-based materials applied in future nuclear reactors have to withstand not only the attack of high-energy neutron and plasma, but also the repeated impact of steady-state or even transient thermal load. Researches in the past decades have proved that tailored nanostructure have advantage in annihilating radiation defects. With the rapid development of nanostructured tungsten, probing radiation application of nanostructured tungsten is of great significance in promoting the development of novel radiation-resistant materials. Herein, the development status of three kinds of nanostructured tungsten namely nanocrystalline, nanofilm and nanoporous tungsten designed for radiation tolerance and the performance enhancement mechanism of diverse nanostructure in irradiation environment is reviewed. Finally, future perspectives and technical challenges are discussed, to inspire more creative designs of novel nanostructured tungsten for radiation tolerance.

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Effects of tantalum concentration on the microstructures and mechanical properties of tungsten-tantalum alloys

Cited by 36 publications

References 22 publications

Evaluation of Fracture Toughness Measurements Using Chevron-Notched Silicon and Tungsten Microcantilevers

Evaluation of Fracture Toughness Measurements Using Chevron-Notched Silicon and Tungsten Microcantilevers

Manufacturing of tungsten and tungsten composites for fusion application via different routes

Recent progress of radiation response in nanostructured tungsten for nuclear application

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