Mechanical behavior of tungsten-vanadium-lanthana alloys as function of temperature

Palacios García, Teresa and Pastor Caño, Jose Ignacio and Aguirre Cebrian, Maria Vega and Martin Sanz, Antonia and Monge, M. A. and Muñoz, A. and Pareja, R. (2013). Mechanical behavior of tungsten-vanadium-lanthana alloys as function of temperature. "Journal of nuclear materials", v. 442 (n. 1-3, S); pp.. ISSN 0022-3115. https://doi.org/10.1016/j.jnucmat.2013.02.006.

Description

Title: Mechanical behavior of tungsten-vanadium-lanthana alloys as function of temperature
Author/s:
  • Palacios García, Teresa
  • Pastor Caño, Jose Ignacio
  • Aguirre Cebrian, Maria Vega
  • Martin Sanz, Antonia
  • Monge, M. A.
  • Muñoz, A.
  • Pareja, R.
Item Type: Article
Título de Revista/Publicación: Journal of nuclear materials
Date: November 2013
ISSN: 0022-3115
Volume: 442
Subjects:
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

The mechanical behavior of three tungsten (W) alloys with vanadium (V) and lanthana (La2O3) additions (W–4%V, W–1%La2O3, W–4%V–1%La2O3) processed by hot isostatic pressing (HIP) have been compared with pure-W to analyze the influence of the dopants. Mechanical characterization was performed by three point bending (TPB) tests in an oxidizing air atmosphere and temperature range between 77 (immersion tests in liquid nitrogen) and 1273 K, through which the fracture toughness, flexural strength, and yield strength as function of temperature were obtained. Results show that the V and La2O3 additions improve the mechanical properties and oxidation behavior, respectively. Furthermore, a synergistic effect of both dopants results in an extraordinary increase of the flexure strength, fracture toughness and resistance to oxidation compared to pure-W, especially at higher temperatures. In addition, a new experimental method was developed to obtain a very small notch tip radius (around 5–7 μm) and much more similar to a crack through the use of a new machined notch. The fracture toughness results were lower than those obtained with traditional machining of the notch, which can be explained with electron microscopy, observations of deformation in the rear part of the notch tip. Finally, scanning electron microscopy (SEM) examination of the microstructure and fracture surfaces was used to determine and analyze the relationship between the macroscopic mechanical properties and the micromechanisms of failure involved, depending on the temperature and the dispersion of the alloy.

More information

Item ID: 26557
DC Identifier: http://oa.upm.es/26557/
OAI Identifier: oai:oa.upm.es:26557
DOI: 10.1016/j.jnucmat.2013.02.006
Official URL: http://www.sciencedirect.com/science/article/pii/S0022311513004121
Deposited by: Memoria Investigacion
Deposited on: 26 May 2014 08:50
Last Modified: 01 Dec 2015 23:56
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