Development of ultra-fine grained W–TiC and their mechanical properties for fusion applications

Kurishita, Hiroaki; Amano, Y.; Kobayashi, Sengo; Nakai, Kenta; Arakawa, Hideo; Hiraoka, Yutaka; Takida, Tomohiro; Takebe, K.; Matsui, Hideki

doi:10.1016/j.jnucmat.2007.04.008

Cited by 203 publications

(97 citation statements)

References 18 publications

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“…As is typical of precipitates, the dispersoids exhibit a preferable orientation relationship with the matrix phase: The Kurdjumov-Sachs (K-S) orientation relationship at the interface between the TiC phase and W matrix 21) meets…”

Section: Microstructuresmentioning

confidence: 99%

Development of Nanostructured Tungsten Based Materials Resistant to Recrystallization and/or Radiation Induced Embrittlement

et al. 2013

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Mitigation of embrittlement caused by recrystallization and radiation is the key issue of tungsten (W) based materials for use in the advanced nuclear system such as fusion reactor applications. In this paper, our nanostructured W materials development performed so far to solve the key issue is reviewed, including new original data. Firstly, the basic concept of mitigation of the embrittlement is shown. The approach to the concept has yielded ultra-fine grained, recrystallized (UFGR) W(0.251.5) mass%TiC compacts containing fine TiC dispersoids (precipitates). The UFGR W(0.251.5)%TiC exhibits favorable as well as unfavorable features from the viewpoints of microstructures and various thermo-mechanical properties including the response to neutron and ion irradiations. Most of the unfavorable features stem from insufficient strengthening of weak random grain boundaries (GBs) in the recrystallized state. The focal point on this study is, therefore, to develop a new microstructural modification method to significantly strengthen the random GBs. The method is designated as GSMM (GB Sliding-based Microstructural Modification) and has lead to the birth of toughened, fine-grained W1.1%TiC in the recrystallized state (TFGR W1.1TiC). The TFGR W1.1TiC exhibits much improved thermo-mechanical properties. The applicability of TFGR W1.1TiC to the divertor in ITER is discussed.

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Section: Microstructuresmentioning

confidence: 99%

Development of Nanostructured Tungsten Based Materials Resistant to Recrystallization and/or Radiation Induced Embrittlement

et al. 2013

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“…In this context, enhancement of the tungsten toughness has been one of the paramount R&D issues in the fusion reactor materials community. In general conventional metallurgical methods have been applied in order to improve the toughness including alloying with rhenium to increase ductility and severe plastic deformation or mechanical alloying followed by HIP to form a nanometer-sized microstructure [1][2][3][4]. Oxide particles dispersion could increase the creep strength but reduced the tensile elongation [2].…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a tungsten wire-reinforced tungsten matrix composite with ZrOx interfacial coatings

Höschen

Rasiński

et al. 2010

Composites Science and Technology

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Brittleness problem imposes a severe restriction on the potential application of tungsten as high-temperature structural material. In this paper, a novel toughening method for tungsten is proposed based on reinforcement by tungsten wires. The underlying toughening mechanism is analogous to that of fiber-reinforced ceramic matrix composites. Strain energy is dissipated by debonding and frictional sliding at engineered fiber/matrix interfaces. To achieve maximum composite toughness fracture mechanical properties have to be optimized by interface coating.In this work, we evaluated six kinds of ZrOx-based interface coatings. Interfacial parameters such as shear strength and fracture energy were determined by means of fiber push-out tests.The parameter values of the six coatings were comparable to each other and satisfied the criterion for crack deflection. Microscopic analysis showed that debonding occurred mostly between the W filament and the ZrO x coating. Feasibility of interfacial crack deflection was also demonstrated by a three-point bending test.

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“…To avoid a fatigue due to this cyclic plastic deformation, the enhancement of the yield stress is indispensable. A highly-engineered material, e.g., ultra fine-grained tungsten (UFG-W) [3] can be a candidate, because the yield stress of UFG-W is much higher than that of the standard tungsten. In addition, by taking the fast strain rate (~10 4 /s) into account, the yield stress of UFG-W can reach to 3 GPa at room temperature [4], whereas ~1.2 GPa for the standard tungsten.…”

Section: Dry Wall Designmentioning

confidence: 99%

Conceptual design of fast-ignition laser fusion reactor FALCON-D

et al. 2009

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Abstract.A new conceptual design of the laser fusion power plant FALCON-D (Fast ignition Advanced Laser fusion reactor CONcept with a Dry wall chamber) has been proposed. The fast ignition method can achieve the sufficient fusion gain for a commercial operation (~100) with about 10 times smaller fusion yield than the conventional central ignition method. FALCON-D makes full use of this property and aims at designing with a compact dry wall chamber (5~6m radius). 1-D/2-D hydrodynamic simulations showed the possibility of the sufficient gain achievement with a 40 MJ target yield. The design feasibility of the compact dry wall chamber and solid breeder blanket system was shown through the thermomecanical analysis of the dry wall and neutronics analysis of the blanket system. A moderate electric output (~400MWe) can be achieved with a high repetition (30Hz) laser. This dry wall concept not only reduces some difficulties accompanied with a liquid wall but also enables a simple cask maintenance method for the replacement of the blanket system, which can shorten the maintenance time. The basic idea of the maintenance method for the final optics system has also been proposed. Some critical R&D issues required for this design are also discussed.

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Development of ultra-fine grained W–TiC and their mechanical properties for fusion applications

Cited by 203 publications

References 18 publications

Development of Nanostructured Tungsten Based Materials Resistant to Recrystallization and/or Radiation Induced Embrittlement

Development of Nanostructured Tungsten Based Materials Resistant to Recrystallization and/or Radiation Induced Embrittlement

Feasibility study of a tungsten wire-reinforced tungsten matrix composite with ZrOx interfacial coatings

Conceptual design of fast-ignition laser fusion reactor FALCON-D

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