Neutron irradiation-induced recrystallization simulation for tungsten in nuclear fusion device
International Journal of Refractory Metals and Hard Materials(2024)
摘要
In magnetic confinement nuclear fusion devices, Tungsten (W) stands out as the most promising material for plasma-facing components, especially for divertor targets exposed to high neutron loads and high heat flux. However, the harsh operational conditions subject W undergoes significant degradation due to irradiation-induced defect production and irradiation-induced recrystallization, resulting in a modification of the original microstructure. These irradiation effects lead to a consequential deterioration in mechanical properties and component durability.This study implements a neutron irradiation-induced recrystallization (NIIR) modeling framework to quantify the recrystallization fraction in the W section of the plasma-facing components (PFCs). The simulation results reveal that the rate of neutron irradiation damage significantly impacts NIIR, leading to varying durations for achieving complete recrystallization in W at elevated temperatures. Furthermore, the half recrystallization time of W experiences a substantial reduction under neutron irradiation, resulting in a thicker recrystallized layer in W-PFCs compared to those without neutron irradiation but at the equivalent heat flux conditions.
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关键词
Nuclear fusion neutron,Irradiation-induced recrystallization,Plasma-facing components,Tungsten
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