Fracture Toughness Investigations of Severe Plastic Deformed Tungsten Alloys

Faleschini, M.; Knabl, W.; Pippan, Reinhard

doi:10.1007/1-4020-4972-2_220

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…Series of SPD tungsten and tungsten-based alloys, i.e. WL10 (W-1% La 2 O 3 ) and WVM (potassium doped tungsten), have been recently produced by high-pressure torsion [127]. The materials present an increase in fracture toughness, up to about 30 MPa m 1/2 at 300 K, and a decrease in DBTT, with respect to untreated materials.…”

Section: Key Issues For Further Development Of Tungsten-based Materia...mentioning

confidence: 99%

Status of R&D activities on materials for fusion power reactors

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Boutard³

et al. 2007

Nucl. Fusion

142

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Current R&D activities on materials for fusion power reactors are mainly focused on plasma facing, structural and tritium breeding materials for plasma facing (first wall, divertor) and breeding blanket components. Most of these activities are being performed in Europe, Japan, the People's Republic of China, Russia and the USA. They relate to the development of new high temperature, radiation resistant materials, the development of coatings that will act as erosion, corrosion, permeation and/or electrical/MHD barriers, characterization of candidate materials in terms of mechanical and physical properties, assessment of irradiation effects, compatibility experiments, development of reliable joints, and development and/or validation of design rules. Priorities defined worldwide in the field of materials for fusion power reactors are summarized, as well as the main achievements obtained during the last few years and the near-term perspectives in the different investigation areas.

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Section: Key Issues For Further Development Of Tungsten-based Materia...mentioning

confidence: 99%

Status of R&D activities on materials for fusion power reactors

Baluc

Abe

Boutard³

et al. 2007

Nucl. Fusion

142

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“…Thus, one can assume that using W powders with suitable grain dimensions and different types of ceramic or metallic dispersions in an SPS (Spark Plasma Sintering)-based processing route might be able to both increase the recrystallization temperature and decrease the DBTT transition of W while maintaining a high value of thermal conductivity. More specifically: Severe plastic deformation of W produces ultrafine grains or texture [ 37 , 38 ], which decreases the W DBTT, even to values well below room temperature. Grain growth and recrystallization can be shifted to higher temperatures by nanometric dispersions, but to the best of our knowledge, no systematic study has been performed to evaluate the effect of the dispersion type and dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…Severe plastic deformation of W produces ultrafine grains or texture [ 37 , 38 ], which decreases the W DBTT, even to values well below room temperature.…”

Section: Introductionmentioning

confidence: 99%

Microengineering Design for Advanced W-Based Bulk Materials with Improved Properties

et al. 2023

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In fusion reactors, such as ITER or DEMO, the plasma used to generate nuclear reactions will reach temperatures that are an order of magnitude higher than in the Sun’s core. Although the plasma is not supposed to be in contact with the reactor walls, a large amount of heat generated by electromagnetic radiation, electrons and ions being expelled from the plasma will reach the plasma-facing surface of the reactor. Especially for the divertor part, high heat fluxes of up to 20 MW/m2 are expected even in normal operating conditions. An improvement in the plasma-facing material (which is, in the case of ITER, pure Tungsten, W) is desired at least in terms of both a higher recrystallization temperature and a lower brittle-to-ductile transition temperature. In the present work, we discuss three microengineering routes based on inclusions of nanometric dispersions, which are proposed to improve the W properties, and present the microstructural and thermophysical properties of the resulting W-based composites with such dispersions. The materials’ behavior after 6 MeV electron irradiation tests is also presented, and their further development is discussed.

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“…[32,33] However this effect does not seem to take place for tungstenvanadium (WV), tungsten-tantalum (WTa) and tungsten-molybdenum (WMo) solid solutions. [32,33,34,35] A second approach is the synthesis of a tungsten material with a UFG microstructure realized by either severe plastic deformation (SPD) via high pressure torsion (HPT) [36,37] or by mechanical alloying. [38,39] The third approach finally makes use of the synthesis of a W compound that can either be reinforced by particles, [40] randomly distributed short fibers [41] or uniaxial long fibers.…”

Section: Introductionmentioning

confidence: 99%

Tungsten (W) Laminate Pipes for Innovative High Temperature Energy Conversion Systems

et al. 2014

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The aim of this paper is to present the mechanical properties of tungsten laminate pipes made of tungsten foil and to discuss their use in innovative high temperature energy conversion systems.Tungsten is the metal with the highest melting point of all metals and would therefore be an excellent fit for high temperature applications. But tungsten has one major drawback which is its low fracture toughness at room temperature (RT) or its high brittle-to-ductile transition 2 temperature (BDTT). However, one of the extraordinary properties of tungsten is that by cold working the BDTT can be shifted to lower temperatures. At the extreme, this results in a tungsten foil with a BDTT below -120°C combined with a RT fracture toughness of 70 MPa m 1/2 .By rolling up and joining a tungsten foil, tungsten laminate pipes can be synthesized that can dissipate at least 20 J in a Charpy impact test at RT and survive a burst test at RT at 1000 bar without any residual damage. The technical maturity of these W laminate pipes is approved by high heat flux tests performed at the Plataforma Solar de Almería, Spain, as well as at the

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Fracture Toughness Investigations of Severe Plastic Deformed Tungsten Alloys

Cited by 9 publications

References 1 publication

Status of R&D activities on materials for fusion power reactors

Status of R&D activities on materials for fusion power reactors

Microengineering Design for Advanced W-Based Bulk Materials with Improved Properties

Tungsten (W) Laminate Pipes for Innovative High Temperature Energy Conversion Systems

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