RT Conference Proceedings
T1 Mechanical behavior of tungsten-vanadium-lanthana alloys as function of temperature
A1 Palacios, T.
A1 Pastor, J.Y.
A1 Aguirre, M. V.
A1 Martín, A.
A1 Monge Alcázar, Miguel Ángel
A1 Muñoz Castellanos, Ángel
A1 Pareja Pareja, Ramiro
AB 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.
PB Elsevier
SN 0022-3115
YR 2011
FD 2011-10
LK https://hdl.handle.net/10016/19798
UL https://hdl.handle.net/10016/19798
LA eng
NO This study is presented of: The Fifteenth International Conference on Fusion Reactor Materials (ICFRM-14) was held October 16–22, 2011, at the Charleston Marriott Hotel in Charleston, South Carolina.
NO This investigation was supported by Comunidad de Madrid (SS2009/MAT-1585), EFDA-ITER (WP12-MAT-W ALLOY), Ministeriode Economía y Competitividad of Spain (ENE2012-39787-C06-05and MAT2012-38541-c02-02).
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RD 17 jul. 2024