Speaker
Description
Tungsten materials have been attracting growing interest as a promising candidate for plasma facing materials (PFMs) based on its high melting point, high temperature strength, and good thermal conductivity as well as its low erosion in fusion radiation environment and low tritium retention. But the inherent disadvantages of tungsten materials, including poor low temperature machinability, low ductility, high ductile-brittle transition temperature (DBTT) and irradiation-induced embrittlement, cannot be ignored for fusion reactor application. In recent studies, some process strategies focus on manufacturing nanostructured tungsten materials through thermo-plastic deformation treatment to resist the defect of tungsten.
In this work, the mechanical properties and transient thermal shock performance of W-TaC alloys prepared by hot pressing(HP) followed by rapid-forging and annealing treatment were investigated. Tungsten powder and TaC powder were mixed through High-energy ball milling and then sintered by hot pressing with temperature of 1800℃ and pressure of 30MPa. Density、hardness 、Tensile strength and total elongation at different temperature of W-TaC alloys were tested respectively. The polished tungsten surfaces were exposed to repetitive ELM-like thermal shock loads at different base temperature and various absorbed energy densities. The thermal shock-induced damages and the microstructure were analysed by scanning electron microscope. The results indicate that strength and ductility can be improved by rapid-forging and subsequent annealing.
| Eligible for student paper award? | Yes |
|---|