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Wurster S.,Austrian Academy of Sciences | Gludovatz B.,Austrian Academy of Sciences | Gludovatz B.,CD Laboratory of Local Analysis of Deformation and Fracture | Gludovatz B.,Lawrence Berkeley National Laboratory | And 3 more authors.
Journal of Nuclear Materials | Year: 2011

The influence of both microstructure and chemical composition on the fracture behaviour of tungsten-tantalum, tungsten-vanadium composites and alloys of varying chemical compositions are investigated. Industrial solid solution tungsten-tantalum alloys with different tantalum contents in the as-forged condition are investigated along with different tungsten-tantalum and tungsten-vanadium composites and alloys made by powder consolidation, severe plastic deformation using high pressure torsion and different subsequent heat treatments. To investigate the fracture behaviour, several crack propagation directions in relation to the forging direction and shear direction, respectively, are taken into account. Heat treatment of the composite material results in a more homogeneous distribution of the alloying element and the impacts of these specific heat treatments on microstructure and fracture toughness are discussed. The fracture experiments are performed within a temperature range from room temperature to 600 °C and reveal a strong dependence of the fracture toughness and fracture morphology on temperature and on the microstructure, and hence the processing history of the materials. © 2011 Elsevier B.V. All rights reserved. Source


Wurster S.,Austrian Academy of Sciences | Gludovatz B.,Austrian Academy of Sciences | Gludovatz B.,CD Laboratory of Local Analysis of Deformation and Fracture | Pippan R.,Austrian Academy of Sciences | Pippan R.,CD Laboratory of Local Analysis of Deformation and Fracture
International Journal of Refractory Metals and Hard Materials | Year: 2010

A big problem when using tungsten as plasma facing components in a future fusion reactor is the very low fracture toughness at low temperatures. Tungsten-rhenium alloys outclasses other tungsten-based materials in terms of increased ductility. We study the reason for this positive effect by investigating the influence of rhenium on the fracture process of tungsten-rhenium alloys at different temperatures (between room temperature and 900 °C). The experiments are performed in a furnace-equipped tensile testing machine with a vacuum chamber, which allows us to perform fracture experiments at elevated temperature without oxidizing the material. Antecedent and subsequent electron backscattered diffraction scans are used to analyse the extent of plastic deformation and the interaction of plastic deformation and the fracture process. Furthermore, the consequences of recrystallization on the fracture process of tungsten-rhenium alloys will be analysed. © 2010 Elsevier Ltd. All rights reserved. Source

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