TY - JOUR
T1 - Development and characterization of powder metallurgically produced discontinuous tungsten fiber reinforced tungsten composites
AU - Mao, Y.
AU - Coenen, J. W.
AU - Riesch, J.
AU - Sistla, S.
AU - Almanstötter, J.
AU - Jasper, B.
AU - Terra, A.
AU - Höschen, T.
AU - Gietl, H.
AU - Bram, M.
AU - Gonzalez-Julian, J.
AU - Linsmeier, Ch
AU - Broeckmann, C.
N1 - Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. We would like to also thank Anna Weddeling from Lehrstuhl für Werkstofftechnik Ruhr-Universität Bochum for the assistance with the HIP process.
Publisher Copyright:
© 2017 Forschungszentrum Jülich.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - In future fusion reactors, tungsten is the prime candidate material for the plasma facing components. Nevertheless, tungsten is prone to develop cracks due to its intrinsic brittleness - a major concern under the extreme conditions of fusion environment. To overcome this drawback, tungsten fiber reinforced tungsten (Wf/W) composites are being developed. These composite materials rely on an extrinsic toughing principle, similar to those in ceramic matrix composite, using internal energy dissipation mechanisms, such as crack bridging and fiber pull-out, during crack propagation. This can help Wf/W to facilitate a pseudo-ductile behavior and allows an elevated damage resilience compared to pure W. For pseudo-ductility mechanisms to occur, the interface between the fiber and matrix is crucial. Recent developments in the area of powder-metallurgical Wf/W are presented. Two consolidation methods are compared. Field assisted sintering technology and hot isostatic pressing are chosen to manufacture the Wf/W composites. Initial mechanical tests and microstructural analyses are performed on the Wf/W composites with a 30% fiber volume fraction. The samples produced by both processes can give pseudo-ductile behavior at room temperature.
AB - In future fusion reactors, tungsten is the prime candidate material for the plasma facing components. Nevertheless, tungsten is prone to develop cracks due to its intrinsic brittleness - a major concern under the extreme conditions of fusion environment. To overcome this drawback, tungsten fiber reinforced tungsten (Wf/W) composites are being developed. These composite materials rely on an extrinsic toughing principle, similar to those in ceramic matrix composite, using internal energy dissipation mechanisms, such as crack bridging and fiber pull-out, during crack propagation. This can help Wf/W to facilitate a pseudo-ductile behavior and allows an elevated damage resilience compared to pure W. For pseudo-ductility mechanisms to occur, the interface between the fiber and matrix is crucial. Recent developments in the area of powder-metallurgical Wf/W are presented. Two consolidation methods are compared. Field assisted sintering technology and hot isostatic pressing are chosen to manufacture the Wf/W composites. Initial mechanical tests and microstructural analyses are performed on the Wf/W composites with a 30% fiber volume fraction. The samples produced by both processes can give pseudo-ductile behavior at room temperature.
KW - crack propagation resistance
KW - fiber reinforced composites
KW - powder metallurgy
KW - pseudo ductile behavior
KW - tungsten
UR - https://www.scopus.com/pages/publications/85030867688
U2 - 10.1088/0031-8949/2017/T170/014005
DO - 10.1088/0031-8949/2017/T170/014005
M3 - Conference article
AN - SCOPUS:85030867688
SN - 0281-1847
VL - 2017
JO - Physica Scripta
JF - Physica Scripta
IS - T170
M1 - 014005
T2 - 16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017
Y2 - 16 May 2017 through 19 May 2017
ER -