[1] X Hu, T Koyanagi, M Fukuda, Y Katoh, L L Snead, B D Wirth. J. Nucl. Mater., 470, 278(2016).

[2] X L Yang, W B Qiu, L Q Chen, J Tang. Tungsten, 1, 141(2019).

[3] Y W You, X S Kong, X B Wu, C S Liu, J L Chen. Nucl. Fusion, 57(2017).

[4] X X Hu, T Koyanagi, M Fukuda, N A P L Kumar, L L Snead, B D Wirth, Y Katoh. J. Nucl. Mater., 480, 235(2016).

[5] W V Renterghem, I Uytdenhouwen. J. Nucl. Mater., 477, 77(2016).

[6] T Hwang, A Hasegawa, K Tomura, N Ebisawa, T Toyama, Y Nagai, M Fukuda, T Miyazawa, T Tanaka, S Nogami. J. Nucl. Mater., 507, 78(2018).

[7] A Hasegawa, M Fukuda, K Yabuuchi, S Nogami. J. Nucl. Mater., 471, 175(2016).

[8] M Fujitsuka, B Tsuchiya, I Mutoh, T Tanabe, T Shikama. J. Nucl. Mater., 283–287, 1148(2000).

[9] O V Ogorodnikova, V Gann. J. Nucl. Mater., 460, 60(2015).

[10] S L Huang, G Ran, P H Lei, N j Chen, S H Wu, N Li, Q Shen. Nucl. Instrum. Method B, 406, 585(2017).

[11] Y X Zhang, X Y Tan, L M Luo, Y Xu, X Zan, Q Xu, K Tokunaga, X Y Zhu, Y C Wu. Fusion Eng. Des., 140, 102(2019).

[12] M H Cui, T L Shen, H P Zhu, J Wang, X Z Cao, P Zhang, L L Pang, C F Yao, K F Wei, Y B Zhu, B S Li, J R Sun, N Gao, X Gao, H P Zhang, Y B Sheng, H L Chang, W H He, Z G Wang. Fusion Eng. Des., 121, 313(2017).

[13] O El-Atwani, E Esquivel, M Efe, E Aydogan, Y Q Wang, E Martinez, S A Maloy. Acta Mater., 149, 206(2018).

[14] A Xu, C Beck, D E J Armstrong, K Rajan, G D W Smith, P A J bagot, S G Roberts. Acta Mater., 87, 121(2015).

[15] A Xu, D E J Armstrong, C Beck, P M Moody, G D W Smith, P A J Bagot, S G Roberts. Acta Mater., 124, 71(2017).

[16] B Huang, L Q Chen, W B Qiu, X L Yang, K Shi, Y Y Lian, X Liu, J Tang. J. Nucl. Mater., 520, 6(2019).

[17] S Nogami, S Watanabe, J Reiser, M Rieth, S Sickinger, A Hasegawa. Fusion Eng. Des., 140, 48(2019).

[18] B Huang, Y Xiao, B He, J J Yang, J L Liao, Y Y Yang, N Liu, Y Y Lian, X Liu, J Tang. Int. J. Refract. Met. Hard Mater., 51, 19(2015).

[19] B He, B Huang, Y Xiao, Y Y Lian, X Liu, J Tang. J. Alloys Compd., 686, 298(2016).

[20] Y Xiao, B Huang, B He, K Shi, Y Y Lian, X Liu, J Tang. J. Alloys Compd., 678, 533(2016).

[21] O V Ogorodnikova, B Tyburska, V K Alimov, K Ertl. J. Nucl. Mater., 415, S661(2011).

[22] G W Egeland, J A Valdez, S A Amloy, K J McClellan, K E Sickafus, G M Bond. J. Nucl. Mater., 435, 77(2013).

[23] K Wang, Q Qi, G J Cheng, L Q Shi. Chin. Phys. Lett., 31(2014).

[24] X D Li, B Bhushan. Mater. Charact., 48, 11(2002).

[25] S J Bull. J. Phys. D: Appl. Phys., 38, R393(2005).

[26] S V Hainsworth, H W Chandler, T F Page. J. Mater. Res., 11, 1987(1996).

[27] M R McGurk, T F Page. J. Mater. Res., 14, 2283(1999).

[28] Ł Ciupiński, O V Ogorodnikova, T Płociński, M Andrzejczuk, M Rasiński, M Mayer, K J Kurzydłowski. Nucl. Instrum. Method B, 317, 159(2013).

[29] M R Gilbert, S L Dudarev, P M Derlet, D G Pettifor. J. Phys.: Condens. Matter, 20(2008).

[30] L K Keys, J P Smith, J Moteff. Phys. Rev., 176, 851(1968).

[31] R Sakamoto, T Muroga, N Yoshida. J. Nucl. Mater., 220–222, 819(1995).

[32] B Huang, J Tang, L Q Chen, X L Yang, Y Y Lian, L Chen, X Liu, X D Cui, L Gu, C T Liu. J. Alloys Compd., 782, 149(2019).

[33] X L Yang, L Q Chen, W B Qiu, Y Y P Song, Y Tang, X D Cui, C S Liu, Y Jiang, T Zhang, J Tang. Chin. Phys. B, 29(2020).

[34] W N Li, J M Xue, J X Wang, H L Duan. Chin. Phys. B, 23(2014).