|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
||Size Effects in Ion-irradiated 800H Steel at High Temperatures Utilizing Microcompression Testing
||Anya Prasitthipayong, David Frazer, Hi Tin Vo, Scott J. Tumey, Andrew M. Minor, Peter Hosemann
|On-Site Speaker (Planned)
In situ microcompression testing has successfully served as a small-scale testing tool for evaluating the mechanical properties due to the uniaxial stress state and the direct observation of deformation mechanisms. However, the sample size effect, which is the phenomenon where yield stress increases with decreasing sample size, has remained an obstacle in order to compare the data using this testing technique to macroscopic data. In this work, the sample size effects at room and at high temperatures are studied in an austenitic Fe-Cr-Ni Alloy 800H, which was irradiated with 70 MeV Fe9+ at 450 C to the total dose of 20.68 dpa. It was found that the sample size effect is less pronounced after ion beam irradiation but is enhanced at elevated temperatures due to the fact that the confined volume plays a stronger role in activating the geometrical necessary dislocations.
||Planned: Supplemental Proceedings volume