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Micromechanical and microstructural properties of tungsten fibers in the as-produced and annealed state : assessment of the potassium doping effect

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Abstract
Due to its high strength and low temperature ductility, tungsten fibers (W-f) have been widely used as reinforcement elements in metallic, ceramic and glass matrix composites to improve the strength, toughness and creep resistance. Materials designed for future fusion reactors also utilize the option of Wf reinforcement, i.a. with a copper (W-f/Cu) or tungsten (W-f/W) matrix. W-f/W composites are being intensively studied as risk mitigation materials to replace bulk tungsten which is susceptible to embrittlement induced by neutrons resulting from fusion reaction. Operation of W-f/W in high temperatures (up to 1300 degrees C and even higher) fusion environment implies a risk of recrystallization and grain growth, which dimishes the attractive properties of tungsten fibers. In this work, we assess this modification of micro-mechanical and microstructural properties of tungsten fibers by means of nanoindentation, scanning electron microscopy, electron back-scattering diffraction analysis and corelate it with the ultimate tensile strength and fracture modes observed in the tensile tests. Both pure W and pottasium doped wires in the as-fabricated and annealed states are investigated and the results are compared with bulk tungsten, also exposed to several annealing temperatures. The results highlight the postive impact of potassium doping which shifts the threshold temperature for the grain growth by about 600 degrees C compared to pure tungsten wire. The results of the nanoindentation revealed systematic linear correlation with the ultimate tensile strength, which therefore offers a complimenatary way of micro-mechanical testing linking it with macro-scale properties of the wires.
Keywords
MECHANICAL-PROPERTIES, REINFORCED TUNGSTEN, NEUTRON-IRRADIATION, TEXTURE EVOLUTION, COMPOSITES, BOUNDARIES, BEHAVIOR, FRACTURE, DUCTILE, PURE, Tungsten, Fiber, Plasticity, Recrystallization, Potassium doped, Annealing, Composites

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MLA
Terentyev, Dmitry, et al. “Micromechanical and Microstructural Properties of Tungsten Fibers in the As-Produced and Annealed State : Assessment of the Potassium Doping Effect.” INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, vol. 81, 2019, pp. 253–71, doi:10.1016/j.ijrmhm.2019.03.012.
APA
Terentyev, D., Paulo De Almeida Reis Tanure, L., Bakaeva, A., Dubinko, A., Nikolic, V., Riesch, J., … Zhurkin, E. (2019). Micromechanical and microstructural properties of tungsten fibers in the as-produced and annealed state : assessment of the potassium doping effect. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 81, 253–271. https://doi.org/10.1016/j.ijrmhm.2019.03.012
Chicago author-date
Terentyev, Dmitry, Leandro Paulo De Almeida Reis Tanure, Anastasiia Bakaeva, Andrii Dubinko, Vladica Nikolic, Johann Riesch, Kim Verbeken, S. Lebediev, and Evgeny Zhurkin. 2019. “Micromechanical and Microstructural Properties of Tungsten Fibers in the As-Produced and Annealed State : Assessment of the Potassium Doping Effect.” INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 81: 253–71. https://doi.org/10.1016/j.ijrmhm.2019.03.012.
Chicago author-date (all authors)
Terentyev, Dmitry, Leandro Paulo De Almeida Reis Tanure, Anastasiia Bakaeva, Andrii Dubinko, Vladica Nikolic, Johann Riesch, Kim Verbeken, S. Lebediev, and Evgeny Zhurkin. 2019. “Micromechanical and Microstructural Properties of Tungsten Fibers in the As-Produced and Annealed State : Assessment of the Potassium Doping Effect.” INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 81: 253–271. doi:10.1016/j.ijrmhm.2019.03.012.
Vancouver
1.
Terentyev D, Paulo De Almeida Reis Tanure L, Bakaeva A, Dubinko A, Nikolic V, Riesch J, et al. Micromechanical and microstructural properties of tungsten fibers in the as-produced and annealed state : assessment of the potassium doping effect. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS. 2019;81:253–71.
IEEE
[1]
D. Terentyev et al., “Micromechanical and microstructural properties of tungsten fibers in the as-produced and annealed state : assessment of the potassium doping effect,” INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, vol. 81, pp. 253–271, 2019.
@article{8610254,
  abstract     = {{Due to its high strength and low temperature ductility, tungsten fibers (W-f) have been widely used as reinforcement elements in metallic, ceramic and glass matrix composites to improve the strength, toughness and creep resistance. Materials designed for future fusion reactors also utilize the option of Wf reinforcement, i.a. with a copper (W-f/Cu) or tungsten (W-f/W) matrix. W-f/W composites are being intensively studied as risk mitigation materials to replace bulk tungsten which is susceptible to embrittlement induced by neutrons resulting from fusion reaction. Operation of W-f/W in high temperatures (up to 1300 degrees C and even higher) fusion environment implies a risk of recrystallization and grain growth, which dimishes the attractive properties of tungsten fibers. In this work, we assess this modification of micro-mechanical and microstructural properties of tungsten fibers by means of nanoindentation, scanning electron microscopy, electron back-scattering diffraction analysis and corelate it with the ultimate tensile strength and fracture modes observed in the tensile tests. Both pure W and pottasium doped wires in the as-fabricated and annealed states are investigated and the results are compared with bulk tungsten, also exposed to several annealing temperatures. The results highlight the postive impact of potassium doping which shifts the threshold temperature for the grain growth by about 600 degrees C compared to pure tungsten wire. The results of the nanoindentation revealed systematic linear correlation with the ultimate tensile strength, which therefore offers a complimenatary way of micro-mechanical testing linking it with macro-scale properties of the wires.}},
  author       = {{Terentyev, Dmitry and Paulo De Almeida Reis Tanure, Leandro and Bakaeva, Anastasiia and Dubinko, Andrii and Nikolic, Vladica and Riesch, Johann and Verbeken, Kim and Lebediev, S. and Zhurkin, Evgeny}},
  issn         = {{0263-4368}},
  journal      = {{INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS}},
  keywords     = {{MECHANICAL-PROPERTIES,REINFORCED TUNGSTEN,NEUTRON-IRRADIATION,TEXTURE EVOLUTION,COMPOSITES,BOUNDARIES,BEHAVIOR,FRACTURE,DUCTILE,PURE,Tungsten,Fiber,Plasticity,Recrystallization,Potassium doped,Annealing,Composites}},
  language     = {{eng}},
  pages        = {{253--271}},
  title        = {{Micromechanical and microstructural properties of tungsten fibers in the as-produced and annealed state : assessment of the potassium doping effect}},
  url          = {{http://dx.doi.org/10.1016/j.ijrmhm.2019.03.012}},
  volume       = {{81}},
  year         = {{2019}},
}

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