@article{93fac8f1cd1e404baa68e6665c370cfe,
title = "Defect characterization, mechanical and thermal property evaluation in CVD-W after low-dose neutron irradiation",
abstract = "Ultra-high purity (> 99.9999 wt%) chemical vapour deposited tungsten (CVD–W) samples were neutron irradiated in the BR2 reactor (Belgium) at Tirr < 210 °C to ~ 0.15 dpa, followed by isochronal annealing at 500, 800 and 1100 °C. Defect characterization showed that dislocation loops dominated the as-irradiated damage microstructure and were mostly ≤5 nm. Void formation was observed after post-irradiation annealing at 1100 °C. The mechanical and thermal properties of CVD-W were evaluated based on tensile tests, Vickers hardness and temperature wave analysis. Fractography study suggested that a transition from intergranular fracture to cleavage fracture took place in the material after neutron irradiation. Hardening was found ~ 23% after irradiation. Subsequent annealing below 800 °C saw further increase in hardness, featuring a maximum value of about Hv = 487. Softening occurred at 1100 °C. Thermal diffusivity dropped by ~ 65% after irradiation and ~ 40% of this degradation recovered at 1100 °C.",
keywords = "CVD-W, Defects, Mechanical properties, Neutron irradiation, Thermal properties",
author = "Xiaoou Yi and Lei Zhang and Wentuo Han and Jiao Chen and Pingping Liu and Yanwei Lv and Jiupeng Song and Luwei Xue and Diancheng Geng and Kenta Yoshida and Takeshi Toyama and Qian Zhan and Farong Wan and Somei Ohnuki and Yasuyoshi Nagai",
note = "Funding Information: Post-irradiation experiments on CVD-W were conducted at the International Research Center for Nuclear Materials Science (Oarai) , Institute for Materials Research (IMR) , Tohuku University . The authors thank the IMR staff for their kind assistance with PIE work. X. Yi acknowledges funding support from the National Natural Science Foundation of China via grant No. 51701014 . Funding Information: Post-irradiation experiments on CVD-W were conducted at the International Research Center for Nuclear Materials Science (Oarai), Institute for Materials Research (IMR), Tohuku University. The authors thank the IMR staff for their kind assistance with PIE work. X. Yi acknowledges funding support from the National Natural Science Foundation of China via grant No. 51701014. Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",
year = "2019",
month = dec,
doi = "10.1016/j.ijrmhm.2019.105004",
language = "English",
volume = "85",
journal = "International Journal of Refractory Metals and Hard Materials",
issn = "0263-4368",
publisher = "Elsevier BV",
}