| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
H-22 (Digital): Helium Irradiation Induced Ultra-high Strength Nanotwinned Cu with Nanovoids |
| Author(s) |
Cuncai Fan, Qiang Li, Jie Ding, Yanxiang Liang, Zhongxia Shang, Jin Li, Ruizhe Su, Jaehun Cho, Di Chen, Yongqiang Wang, Jian Wang, Haiyan Wang, Xinghang Zhang |
| On-Site Speaker (Planned) |
Cuncai Fan |
| Abstract Scope |
In this work, we utilize the micropillar compression test to investigate the mechanical properties of He ion irradiated nanotwinned Cu with pre-existing nanovoids. In comparison with coarse-grained Cu, nanovoid nanotwinned Cu exhibits prominently improved radiation tolerance with less He bubbles and smaller dislocation loops, but it experiences higher radiation-induced strengthening. Furthermore, compression tests reveal that the irradiated NV-NT Cu has an ultrahigh yield strength of ~ 1.6 GPa with significant plasticity and detwinning at compressed micropillar tops. Post radiation analyses show that twin boundaries are decorated with He bubbles and thick stacking faults. Molecular dynamics (MD) simulation suggests that stacking fault modified twin boundaries introduce significant strengthening in nanotwinned Cu. This study provides new insights into understanding the radiation response of nanostructured metals. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |