Formation of ⟨100⟩ dislocation loop in bcc-Fe via the ternary loop reaction

SCRIPTA MATERIALIA

卷:162

Article

Wang, Xiaoyang¹  Gao, Ning²  Wang, Yinan¹  Wu, Xiaoyu¹  Shu, Guogang³  Li, Chengliang³  Li, Qiulin⁴  Xu, Ben¹  Liu, Wei¹ 

[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Inst Modern Phys, Lab Adv Nucl Mat, 509 NanChang Rd, Lanzhou 730000, Gansu, Peoples R China

[3] China Nucl Power Engn Co Ltd, State Key Lab Nucl Power Safety Monitoring Techno, Shenzhen 518172, Peoples R China

[4] Tsinghua Univ, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China

关键词: Defect evolution;    Dislocation loop;    Irradiation effect;    Molecular dynamics;   

DOI  :  10.1016/j.scriptamat.2018.11.002

来源: Elsevier

【 摘 要 】

In nuclear power plants, body centered cubic (bcc) iron-based alloys are used widely and their mechanical properties are degraded significantly because of irradiation-induced defects. The prevalence of the < 100 > dislocation loops contradicts the rigorous condition for their formation. In this study, we report the process responsible for the formation of the < 100 > dislocation loop, which involves a 1/2 < 111 > loop with a pre-existing sessile complex or simply three differently oriented 1/2 < 111 > dislocation loops. The formation of the < 100 > loop via the tri-loop mechanism has a very low energy barrier and is favored over the formation of the 1/2 < 111 > dislocation loop. (C) 2018 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

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