Microstructural and mechanical characterization of annealed tungsten (W) and potassium-doped tungsten foils

Palacios García, Teresa and Reiser, J. and Hoffmann, J. and Rieth, M. and Hoffmann, A. and Pastor Caño, Jose Ignacio (2015). Microstructural and mechanical characterization of annealed tungsten (W) and potassium-doped tungsten foils. "International Journal of Refractory Metals and Hard Materials", v. 48 ; pp. 145-149. ISSN 0263-4368. https://doi.org/10.1016/j.ijrmhm.2014.09.005.

Description

Title: Microstructural and mechanical characterization of annealed tungsten (W) and potassium-doped tungsten foils
Author/s:
  • Palacios García, Teresa
  • Reiser, J.
  • Hoffmann, J.
  • Rieth, M.
  • Hoffmann, A.
  • Pastor Caño, Jose Ignacio
Item Type: Article
Título de Revista/Publicación: International Journal of Refractory Metals and Hard Materials
Date: January 2015
ISSN: 0263-4368
Volume: 48
Subjects:
Freetext Keywords: Potassium-doped tungsten foil; grain growth
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Here we show that potassium-doped tungsten foil should be preferred to pure tungsten foil when considering tungsten laminate pipes for structural divertor applications. Potassium-doped tungsten materials are well known from the bulb industry and show an enhanced creep and recrystallization behaviour that can be explained by the formation of potassium-filled bubbles that are surrounding the elongated grains, leading to an interlocking of the microstructure. In this way, the ultra-fine grained (UFG) microstructure of tungsten foil can be stabilized and with it the extraordinary mechanical properties of the foil in terms of ductility, toughness, brittle-to-ductile transition, and radiation resistance. In this paper we show the results of three-point bending tests performed at room temperature on annealed pure tungsten and potassium-doped tungsten foils (800, 900, 1000, 1100, 1200, 1300, 1400, 1600, 1800, 2000, 2200, and 2400 °C for 1 h in vacuum). The microstructural assessment covers the measurement of the hardness and analyses of fractured surfaces as well as a comparison of the microstructure by optical microscopy. The results show that there is a positive effect of potassium-doped tungsten foils compared to pure tungsten foil and demonstrate the potential of the doped foil

Funding Projects

TypeCodeAcronymLeaderTitle
Horizon 2020633053EUROfusionUnspecifiedImplementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
Government of SpainMAT2012-38541-C02-02UnspecifiedUnspecifiedUnspecified

More information

Item ID: 35447
DC Identifier: http://oa.upm.es/35447/
OAI Identifier: oai:oa.upm.es:35447
DOI: 10.1016/j.ijrmhm.2014.09.005
Official URL: http://www.sciencedirect.com/science/article/pii/S0263436814002200
Deposited by: Memoria Investigacion
Deposited on: 28 May 2015 15:21
Last Modified: 30 May 2019 17:55
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