High-temperature annealing of proton irradiated beryllium - A dilatometry-based study
详细信息 查看全文
- 作者：Nikolaos Simosa ; simos@bnl.gov" class="auth_mail" title="E-mail the corresponding author ; Mohamed Elbakhshwana ; Zhong Zhonga ; Sanjit Ghosea ; Ilyas Savkliyildizb
- 关键词：Irradiation damage ; High temperature annealing ; Oxidation ; Transmutation gas ; Beryllium
- 刊名：Journal of Nuclear Materials
- 出版年：2016
- 出版时间：15 August 2016
- 年：2016
- 卷：477
- 期：Complete
- 页码：1-17
- 全文大小：5110 K
文摘
S
200 F grade beryllium has been irradiated with 160 MeV protons up to 1.2 1020 cm−2 peak fluence and irradiation temperatures in the range of 100–200 °C. To address the effect of proton irradiation on dimensional stability, an important parameter in its consideration in fusion reactor applications, and to simulate high temperature irradiation conditions, multi-stage annealing using high precision dilatometry to temperatures up to 740 °C were conducted in air. X-ray diffraction studies were also performed to compliment the macroscopic thermal study and offer a microscopic view of the irradiation effects on the crystal lattice. The primary objective was to qualify the competing dimensional change processes occurring at elevated temperatures namely manufacturing defect annealing, lattice parameter recovery, transmutation 4He and 3H diffusion and swelling and oxidation kinetics. Further, quantification of the effect of irradiation dose and annealing temperature and duration on dimensional changes is sought. The study revealed the presence of manufacturing porosity in the beryllium grade, the oxidation acceleration effect of irradiation including the discontinuous character of oxidation advancement, the effect of annealing duration on the recovery of lattice parameters recovery and the triggering temperature for transmutation gas diffusion leading to swelling.
200 F grade beryllium has been irradiated with 160 MeV protons up to 1.2 1020 cm−2 peak fluence and irradiation temperatures in the range of 100–200 °C. To address the effect of proton irradiation on dimensional stability, an important parameter in its consideration in fusion reactor applications, and to simulate high temperature irradiation conditions, multi-stage annealing using high precision dilatometry to temperatures up to 740 °C were conducted in air. X-ray diffraction studies were also performed to compliment the macroscopic thermal study and offer a microscopic view of the irradiation effects on the crystal lattice. The primary objective was to qualify the competing dimensional change processes occurring at elevated temperatures namely manufacturing defect annealing, lattice parameter recovery, transmutation 4He and 3H diffusion and swelling and oxidation kinetics. Further, quantification of the effect of irradiation dose and annealing temperature and duration on dimensional changes is sought. The study revealed the presence of manufacturing porosity in the beryllium grade, the oxidation acceleration effect of irradiation including the discontinuous character of oxidation advancement, the effect of annealing duration on the recovery of lattice parameters recovery and the triggering temperature for transmutation gas diffusion leading to swelling.