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Vanadium alloys are considered as the candidate materials for structure application in fusion reactors because of their low radiation-induced activation, high resistance to radiation damage, high thermal conduction, and low thermal expansion coefficient. Before these materials, which will be exposed to high-flux hydrogen and helium isotopes, may be safely used in fusion device much more data based on irradiation damage are required. The study of dislocation loops in vanadium is designed to indicate the mechanism of void growing under irradiation. The mechanism is that different types of dislocation loops have different bias which represent their abilities to absorb point defects. It is possible to explain the irradiation swelling performance in the material with the bias of loops. The thin disks samples used in this experiment are made of pure vanadium and vanadium alloy (V-4Cr-4Ti) by twin-jet electro-polishing. Electrolyte of H2SO4-CH3OH (1 : 6 by volume) at -20 ℃ is used in a current of 80～120 mA. To get a clear view of dislocation loops, the SRIM code is used to simulate the implantation of hydrogen ions into vanadium. The ion irradiation is carried out to a dose of 51016H+/cm2, at an energy of 30 keV. Microstructure observations are performed on a Tecnai G2 F20 (transmission electron microscope, TEM) at an accelerating voltage of 200 kV. The Burger's vectors and nature of the dislocation loops formed in pure vanadium by hydrogen implantation are confirmed by TEM. This experiment has focused on as many as 76 dislocation loops, lots of images are taken under different diffraction conditions from the same areas of interest. Results show that most of the dislocation loops have a Burger's vectors of 1/2111 (90%), and a few of 110. No loops with b= 100 loops can be found in this study. The nature of dislocation loops is determined by the inside-outside method. The number of the dislocation loops that can make sure of their nature is 29, and all of them are conformed to be interstitial type, their habit planes are from {110} to {112}. No vacancy type loops are found. The density and average size of dislocation loops in vanadium and vanadium alloy are also analysed. Compared with the pure vanadium, the loops in vanadium alloy of V-4Cr-Ti are formed in a smaller size and higher number density. As a future work the difference of the loops nature between pure vanadium and vanadium-based alloys should be investigated to illustrate their behaviour of irradiation swelling.
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Keywords:
- vanadium /
- transmission electron microscopy (TEM) /
- dislocation loops /
- hydrogen
[1] Ivanov L I, Ivanov V V, Lazorenko V M, Platovet U M, Tovtin V I 1992 J. Nucl. Mater. 191-194 928
[2] Fukumoto K, Kuroyanagi Y, Kuroiwa H, Narui M, Matsui H 2011 J. Nucl. Mater. 417 295
[3] Nishizawa T, Sasaki H, Ohnuki S, Takahashi H, Sshibayama T, Kayano H 1996 J. Nucl. Mater. 239 132
[4] Yao Z, Hernndez-Mayoral M, Jenkins M L, Kirc M A 2008 Phil. Mag. 88 2851
[5] Yao Z, Jenkins M L, Jenkins M L, Kirc M A 2008 Phil. Mag. 88 2881
[6] Huang Y N, Wan F R, Jiao Z J 2011 Acta Phys. Sin. 60 036802 (in Chinese) [黄依娜, 万发荣, 焦治杰 2011 物理学报 60 036802]
[7] Wan F R, Zhang Q, Long Y, Yang S W, Zhang G W, Du Y F, Jiao Z J, Ohuki S 2014 J. Nucl. Mater. 455 253
[8] Zhang C X, Lu E Y, Jin S X, Zhang P, Li Y H, Cao X Z, Wang B Y 2014 The Twelfth National Conference of Positron Annihilation Spectrum Yantai City, Shandong Province, 2014.07.09-2014.07.13 pp68-70 (in Chinese) [张春雄, 卢二阳, 靳硕学, 张鹏, 李玉红, 曹兴忠, 王宝义2014 第十二届全国正电子谱学会议论文集 山东省烟台市 2014.07.09-2014.07.13 第68-70页]
[9] Yu G, Ma Y, Cai J, Lu D G 2012 Chin. Phys. B 21 036101
[10] Jin S X 2013 Ph.D. Dissertation (Wuhan: Wuhan University) (in Chinese) [靳硕学 2013 博士学位论文 (武汉: 武汉大学)]
[11] Rice P M, Zinkle S J 1998 J. Nucl. Mater. 258-263 1414
[12] Nagasaka N, Muroga T, Watanabe H, Yamasaki K, Heo N, Shinozaki K, Narui M 2005 Mate. Trans. 46 498
[13] Kawanishi H, Ishino S, Kuramoto E 1986 J. Nucl. Mater. 141-143 899
[14] Kawanishi H, Ishino S 1988 J. Nucl. Mater. 155-157 940
[15] Matsui H 1994 Plas. Fus. Res. 70 807
[16] Leguey T, Pareja R, Hodgson E R 1996 J. Nucl. Mater. 231 191
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[1] Ivanov L I, Ivanov V V, Lazorenko V M, Platovet U M, Tovtin V I 1992 J. Nucl. Mater. 191-194 928
[2] Fukumoto K, Kuroyanagi Y, Kuroiwa H, Narui M, Matsui H 2011 J. Nucl. Mater. 417 295
[3] Nishizawa T, Sasaki H, Ohnuki S, Takahashi H, Sshibayama T, Kayano H 1996 J. Nucl. Mater. 239 132
[4] Yao Z, Hernndez-Mayoral M, Jenkins M L, Kirc M A 2008 Phil. Mag. 88 2851
[5] Yao Z, Jenkins M L, Jenkins M L, Kirc M A 2008 Phil. Mag. 88 2881
[6] Huang Y N, Wan F R, Jiao Z J 2011 Acta Phys. Sin. 60 036802 (in Chinese) [黄依娜, 万发荣, 焦治杰 2011 物理学报 60 036802]
[7] Wan F R, Zhang Q, Long Y, Yang S W, Zhang G W, Du Y F, Jiao Z J, Ohuki S 2014 J. Nucl. Mater. 455 253
[8] Zhang C X, Lu E Y, Jin S X, Zhang P, Li Y H, Cao X Z, Wang B Y 2014 The Twelfth National Conference of Positron Annihilation Spectrum Yantai City, Shandong Province, 2014.07.09-2014.07.13 pp68-70 (in Chinese) [张春雄, 卢二阳, 靳硕学, 张鹏, 李玉红, 曹兴忠, 王宝义2014 第十二届全国正电子谱学会议论文集 山东省烟台市 2014.07.09-2014.07.13 第68-70页]
[9] Yu G, Ma Y, Cai J, Lu D G 2012 Chin. Phys. B 21 036101
[10] Jin S X 2013 Ph.D. Dissertation (Wuhan: Wuhan University) (in Chinese) [靳硕学 2013 博士学位论文 (武汉: 武汉大学)]
[11] Rice P M, Zinkle S J 1998 J. Nucl. Mater. 258-263 1414
[12] Nagasaka N, Muroga T, Watanabe H, Yamasaki K, Heo N, Shinozaki K, Narui M 2005 Mate. Trans. 46 498
[13] Kawanishi H, Ishino S, Kuramoto E 1986 J. Nucl. Mater. 141-143 899
[14] Kawanishi H, Ishino S 1988 J. Nucl. Mater. 155-157 940
[15] Matsui H 1994 Plas. Fus. Res. 70 807
[16] Leguey T, Pareja R, Hodgson E R 1996 J. Nucl. Mater. 231 191
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