Toughness enhancement of tungsten reinforced with short tungsten fibres

Jiang, Yabin; Zhang, L.H.; Fang, Q.F.; Zhang, T.; Wang, X.P.; Hao, Ting; Liu, C.S.

doi:10.1016/j.msea.2017.02.106

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…The shiny fracture surfaces of M show brittle fracture under tension and compression (figures 16(a) and (b)). Therefore, the contribution of the matrix (M) in the dissipation of concentrated stress is insignificant [109]. Random mixing of W sf in M gives rise to the random orientation of W sf across the fracture plane (FP), i.e.…”

Section: Results and Analysismentioning

confidence: 99%

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

Waseem

Ryu

2018

Nucl. Fusion

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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.

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Section: Results and Analysismentioning

confidence: 99%

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

Waseem

Ryu

2018

Nucl. Fusion

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“…Since a decade, a promising method of toughening tungsten composites using tungsten fiber reinforcement has been actively pursued, namely, tungsten fiberreinforced tungsten (W f /W) composites [64][65][66][67][68][69][70][71][72]. However, in the bared W f /W, the interface is not obvious due to the chemical reaction between W f and W matrices, so the reinforcing effect is not ideal.…”

Section: W Fiber-reinforced W F /W Compositesmentioning

confidence: 99%

The Tungsten-Based Plasma-Facing Materials

Zhang¹,

Xie²,

Liu³

et al. 2020

Fusion Energy

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The plasma-facing materials in fusion reactors will face very extreme servicing condition such as high temperatures, high thermal loads, extreme irradiation conditions induced by high-energy neutron, and high fluences of high-flux and low-energy plasma. Tungsten is considered as the most promising material for plasma-facing components (PFCs) in the magnetic confinement fusion devices, due to its high melting temperature, high thermal conductivity, low swelling, low tritium retention, and low sputtering yield. However, some important shortcomings such as the irradiation brittleness and high ductility-brittle transition temperature of pure tungsten limit its application. Focusing on this issue, various W alloys with enhanced performance have been developed. Among them, nanoparticle dispersion strengthening such as oxide particle dispersion-strengthened (ODS-W) and carbide particle dispersion-strengthened (CDS-W) tungsten alloys and W fiber-reinforced W f /W composites are promising. This chapter mainly reviews the preparation, microstructure, properties, regulation, and service performance evaluation of ODS-W, CDS-W, and W f /W materials, as well as future possible development is proposed.

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“…The chemical composition of the fibres is given in our previous work [16,24]. The theoretical density of the W fibres can be considered as 19.3 g/cm 3 , as same as the value of pure tungsten.…”

Section: Preparation and Characterizationmentioning

confidence: 99%

“…[15]. Among the different fibres, tungsten fibres possess high strength, fine ductility, high recrystallization temperature (>1800 °C) and plastic rupture [16], which could contribute substantially to the toughness of tungsten matrix. Riesch and Du et al carried out extensive studies on small-size fabrication of tungsten fibre reinforced tungsten composites by chemical vapor infiltration or chemical vapor deposition [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [16,24], the spark plasma sintering (SPS) method was exploited to prepare tungsten-fibre reinforced tungsten composites (Wf/W), and compact composites were obtained because of the unique features of SPS (large pulsed DC current provides fast heating/cooling rate and short consolidation time, which helps obtain high density and fine grains). However, the non-uniform temperature distribution limits the large-scale production of Wf/W composites.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Investigation of Tungsten Fibre Nets Reinforced Tungsten Composite Fabricated by Three Different Methods

Zhang

Jiang

Fang

et al. 2017

Metals

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Tungsten fibre nets reinforced tungsten composites (W f /W) containing four net layers were fabricated by spark plasma sintering (SPS), hot pressing (HP) and cold rolling after HP (HPCR), with the weight fraction of fibres being 17.4%, 10.5% and 10.5%, respectively. The relative density of the HPCRed samples is the highest (99.8%) while that of the HPed composites is the lowest (95.1%). Optical and scanning electron microscopy and electron back scattering diffraction were exploited to characterize the microstructure, while tensile and hardness tests were used to evaluate the mechanical properties of the samples. It was found that partial recrystallization of fibres occurred after the sintering at 1800 • C. The SPSed and HPed W f /W composites begin to exhibit plastic deformation at 600 • C with tensile strength (TS) of 536 and 425 MPa and total elongation at break (TE) of 11.6% and 23.0%, respectively, while the HPCRed W f /W composites exhibit plastic deformation at around 400 • C. The TS and TE of the HPCRed W f /W composites at 400 • C are 784 MPa and 8.4%, respectively. The enhanced mechanical performance of the W f /W composites over the pure tungsten can be attributed to the necking, cracking, and debonding of the tungsten fibres.

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Toughness enhancement of tungsten reinforced with short tungsten fibres

Cited by 18 publications

References 15 publications

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

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

The Tungsten-Based Plasma-Facing Materials

Comparative Investigation of Tungsten Fibre Nets Reinforced Tungsten Composite Fabricated by Three Different Methods

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