|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||In-situ Studies on Radiation Response of a Nanotwinned Steel
||Zhongxia Shang, Tongjun Niu, Tianyi Sun, Sichuang Xue, Wei-Ying Chen, Meimei Li, Haiyan Wang, Xinghang Zhang
|On-Site Speaker (Planned)
Recent studies on nanotwinned pure metals, such as Cu and Ag, show that twin boundaries are appealing defect sinks during heavy ion irradiation as twin boundaries can transport and eliminate radiation-produced defects. However, the response of twin boundaries in nanotwinned structural steels under irradiation is rarely explored. Here, we investigate the microstructural evolution of a nanotwinned steel via in situ Kr++ irradiation at room temperature to ~ 4 dpa. The in situ study shows that nanotwins in steels can effectively suppress the formation of irradiation-induced dislocation loop rafts. Also the formation of loop rafts and Frank loops was found to depend prominently on twin spacing. The underlying mechanisms of enhanced radiation tolerance in nanotwinned steel are discussed. The present study provides a positive step towards the application of nanotwinned structural materials to nuclear industries.