Microstructure and properties of W-TiC/Cf composites prepared by spark plasma sintering

Chen, Haiwang; Luo, Laima; Tan, Xiao–Yue; Luo, Guang–Nan; Li, P.; Zan, Xiang; Zhu, Xiaohua; Wu, Yang

doi:10.1533/9780081002254.463

Cited by 3 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effects of carbon fibers (C f ) on W were studied by adding 0.5wt% and 2wt% C f with an average diameter of ~7-8 μm to W powders with a grain size of 1.2μm, with 1%TiC also added to the composite. All samples showed relative density levels exceeding 97%, and the density of the TiC/W with 0.5wt%C f sample was 98.36% [24]. A mechanical load moves dislocations and concentrates stress, also rupturing TiC particles or dislocating/detaching TiC from W to nucleate.…”

Section: Fiber-or Whisker-reinforced Compositesmentioning

confidence: 96%

“…Micropores then grow, coalesce and fracture. However, these phenomena are rarely observed in TiC/W with 2wt%C f composites [24].…”

Section: Fiber-or Whisker-reinforced Compositesmentioning

confidence: 97%

“…W has unique characteristics, which have increased its value relative to other materials. The properties which confer this valuable status in nuclear engineering include its refractoriness, high melting point, high thermal conductivity, low thermal expansion coefficient, good chemical stability, high heat resistance, high sputtering threshold energy, low sputtering rate, low erosion rate at edge plasma temperatures of less than 40-50 eV, low deuterium/tritium retention rate, low tritium permeability, high moduli of elasticity, good thermal shock resistance, lack of hydride formation and adequate corrosion resistance [12,15,[18][19][20][21][22][23][24][25][26][27][28][29][30]. The use of W is associated with other advantages as well.…”

Section: Advantages Of W and Drawbacks Of Using Pure W In Fusion Applmentioning

confidence: 99%

“…The use of W above its recrystallization temperature interminably can be unsafe because its mechanical properties decrease in such an environment [19,21]. W is also associated with high embrittlement due to irradiation at low temperatures [4,22,24], and the DBTT of W increases with an increase in the radiation level [29]. Low-temperature brittleness imposes restrictions on the application of tungsten as a structural material [25,27,28].…”

Section: Advantages Of W and Drawbacks Of Using Pure W In Fusion Applmentioning

confidence: 99%

“…Fibers play a very effective role in the enhancement of the mechanical properties of materials by transmitting and bearing loads while stretching. By absorbing energy, fibers prolong or deflect the paths of cracks as they propagate while also improving the strength and toughness of fiber-based composites [24]. By frictional sliding and debonding of the fiber/matrix interface, fibers control cracking and enhance the load-bearing capacity of composite materials.…”

Section: Fiber-or Whisker-reinforced Compositesmentioning

confidence: 99%

See 4 more Smart Citations

Tungsten-Based Composites for Nuclear Fusion Applications

Waseem¹,

Ryu²

2016

Nuclear Material Performance

View full text Add to dashboard Cite

This chapter provides a comprehensive knowledge about the potential role of tungstenbased composites in fusion reactors and the research work which has been done in this very important area of nuclear materials. The characteristics of tungsten, which make it the most potential candidate for plasma-facing applications, have been presented along with the shortcomings in pure tungsten. The research work that has been done so far in the field of tungsten-based composites to overcome the problems with pure tungsten has been included. The fabrication, characterization, types of reinforcements and the classes of composites have been reviewed. The behavior of tungsten-based composites under various kinds of loads i.e. mechanical and thermal and environments radiations and oxidizing etc. has been summarized.

show abstract

Section: Fiber-or Whisker-reinforced Compositesmentioning

confidence: 96%

“…Micropores then grow, coalesce and fracture. However, these phenomena are rarely observed in TiC/W with 2wt%C f composites [24].…”

Section: Fiber-or Whisker-reinforced Compositesmentioning

confidence: 97%

Section: Advantages Of W and Drawbacks Of Using Pure W In Fusion Applmentioning

confidence: 99%

Section: Advantages Of W and Drawbacks Of Using Pure W In Fusion Applmentioning

confidence: 99%

Section: Fiber-or Whisker-reinforced Compositesmentioning

confidence: 99%

See 3 more Smart Citations

Tungsten-Based Composites for Nuclear Fusion Applications

Waseem¹,

Ryu²

2016

Nuclear Material Performance

View full text Add to dashboard Cite

show abstract

Toughening of a low-activation tungsten alloy using tungsten short fibers and particles reinforcement for fusion plasma-facing applications

Waseem

Ryu

2018

Nucl. Fusion

View full text Add to dashboard Cite

Novel low-activation tungsten (W) alloy-based composites are investigated here. A W0.5TaTiVCr matrix (M) was selected due to its promising strength (more than two times that of pure W) and low activation properties. W short fibers (Wsf) or W particles (Wp) were embedded in W0.5TaTiVCr in an effort to improve the fracture strain. Unlike W-fiber-reinforced-W-matrix-composites, near-isotropic composites with nearly full densities were developed via the simple fabrication method (as compared to hot isostatic pressing and chemical vapor infiltration) of elemental powder mixing followed by spark plasma sintering (SPS) at 1600 °C. Microstructural characterization reveals randomly dispersed and well-bonded W reinforcements with the matrix, which shows the body-centered cubic (BCC) crystal structure and multiple phases. The fracture strain of W0.5TaTiVCr under compressive stress shows a two-fold improvement from ~4.3% to ~9.3% due to the addition of 10 wt.%Wp while maintaining a high yield strength of ~1900 MPa. An addition of 50 wt.%Wp results in ~16% fracture strain. The addition of 10 wt.%Wsf results in four times higher fracture toughness (from ~7.7 to ~29.6 MPa · m1/2). The mechanisms determining the improvement in the fracture strain and toughness due to the addition of the Wsf and Wp are discussed based on the fracture surface analysis.

show abstract

W_0.5TaTiVCr-based composite reinforced with W-mesh for fusion plasma-facing applications

Waseem

Ryu

2020

Funct. Compos. Struct.

View full text Add to dashboard Cite

We present research into tungsten (W) alloy-based composites reinforced with a W-mesh. Due to low activation and higher strength properties, W 0.5 TaTiVCr was used as a matrix material. Layers of W-mesh (W mesh ) were embedded in W 0.5 TaTiVCr for improving ductility and toughness. We employed elemental powder mixing and spark plasma sintering (SPS) at 1600 • C for sample preparation, which is a simpler method as compared to chemical vapor infiltration and hot isostatic pressing. The microstructural analysis shows a W-mesh that is well-bonded with the W 0.5 TaTiVCr matrix, which exhibits multiple phases and a BCC structure. The room temperature compressive fracture strain of W 0.5 TaTiVCr/W mesh composites show an improvement from ~3.5% to ~15.8% due to increase in W mesh concentration from 10 wt% to 50 wt%, whereas the compressive yield strength changes from ~1900 MPa to ~1700 MPa (at room temperature) and ~1200 MPa to ~950 MPa (at 1200 • C). The W 0.5 TaTiVCr matrix alone shows ~7.7 MPa m 1/2 fracture strain, and the addition of 10 wt%W mesh in W 0.5 TaTiVCr results in more than a two-fold increase in fracture toughness (up to ~20 MPa m 1/2 ), which suggests a potential use of this material in fusion reactors.

show abstract

Microstructure and properties of W-TiC/Cf composites prepared by spark plasma sintering

Cited by 3 publications

References 4 publications

Tungsten-Based Composites for Nuclear Fusion Applications

Tungsten-Based Composites for Nuclear Fusion Applications

Toughening of a low-activation tungsten alloy using tungsten short fibers and particles reinforcement for fusion plasma-facing applications

W_0.5TaTiVCr-based composite reinforced with W-mesh for fusion plasma-facing applications

Contact Info

Product

Resources

About

Microstructure and properties of W-TiC/Cf composites prepared by spark plasma sintering

Cited by 3 publications

References 4 publications

Tungsten-Based Composites for Nuclear Fusion Applications

Tungsten-Based Composites for Nuclear Fusion Applications

Toughening of a low-activation tungsten alloy using tungsten short fibers and particles reinforcement for fusion plasma-facing applications

W0.5TaTiVCr-based composite reinforced with W-mesh for fusion plasma-facing applications

Contact Info

Product

Resources

About

W_0.5TaTiVCr-based composite reinforced with W-mesh for fusion plasma-facing applications