【摘 要】
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Material property degradation of Tungsten(W)by neutron irradiation is one of key issues for plasma facing components in fusion power reactor.Displacement damage will cause irradiation hardening and em
【机 构】
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Department of Quantum Science and Energy Engineering,Tohoku University,Sendai 980-8579 Japan
【出 处】
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第13届中日双边先进能源系统和聚变裂变工程材料会议(CIS-13)
论文部分内容阅读
Material property degradation of Tungsten(W)by neutron irradiation is one of key issues for plasma facing components in fusion power reactor.Displacement damage will cause irradiation hardening and embrittlement of W materials and nuclear transmutation introduced solid-element impurities such as Rhenium(Re)and Osmium(Os),and gas-element such as Helium(He)and Hydrogen(H)will accelerate the embrittlement.It is well known that damage defect clusters such as voids and dislocation loops causes irradiation hardening.In the case of neutron irradiated W,irradiation induced precipitates containing the transmuted Re and Os also cause additional hardening,but visible precipitates had not been confirmed in low dpa irradiated W.In order to study the hardening mechanism of neutron irradiated W,microstructure analysis by Atom Probe Tomography(APT)and Transmission Electron Microscope(TEM)were conducted to neutron irradiated W and W-Re alloys in Joyo.Uniform dilute Re distribution were detected in the irradiated pure W and small Re containing clusters,which were invisible by TEM,were confirmed by APT in W-5%Re alloys.Contribution of irradiation hardening by the Re rich cluster and the effects of damage structure development of W in fusion neutron irradiation conditions will be presented.
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