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Fabrication and fracture behaviors of the continuous brittle fiber reinforced tungsten composites fabricated via field-assisted sintering technology
- Source :
- Tungsten; March 2025, Vol. 7 Issue: 1 p172-182, 11p
- Publication Year :
- 2025
-
Abstract
- Tungsten (W) is a promising candidate material for the plasma-facing components in future fusion reactors. However, it has issues regarding the intrinsic brittleness as well as operational embrittlement. Tungsten fiber reinforced tungsten (Wf/W) composites overcome these issues by using extrinsic toughening mechanisms. Due to neutron irradiation and high-temperature recrystallization during fusion operation, the ductility of the fibers may degrade over a long period of service. Therefore, it is necessary to investigate the fracture behavior of Wf/W composites with brittle fibers. In the present work, the tungsten fibers were embrittled by carbonization. Subsequently, the continuous brittle Wf/W composite with yttrium oxide (Y2O3) interface was fabricated by the field-assisted sintering technology process. The microstructure of the prepared Wf/W composites was characterized. The fracture behavior and toughening mechanisms were discussed in detail based on the experimental results of 3-point bending tests and the corresponding finite element simulation. The composites show a pseudo-ductile fracture behavior. Cracks are hindered and deflected by the de-bonded fiber-matrix interface. The extrinsic toughening mechanisms of interface de-bonding, crack bridging, and fiber pull-out are active. This indicates the reinforcement concept still works even though all components in the Wf/W are brittle.
Details
- Language :
- English
- ISSN :
- 26618028 and 26618036
- Volume :
- 7
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Tungsten
- Publication Type :
- Periodical
- Accession number :
- ejs67212576
- Full Text :
- https://doi.org/10.1007/s42864-024-00291-z