About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
Quasi-static to Dynamic Transition in Strengthening Effects of Helium Bubbles in Copper |
Author(s) |
Calvin R. Lear, David R Jones, Jonathan G Gigax, Daniel T Martinez, Rachel M Flanagan, Minh T Hoang, Jeremy R Payton, Michael B Prime, Saryu J Fensin |
On-Site Speaker (Planned) |
Calvin R. Lear |
Abstract Scope |
The development of advanced modeling tools and cutting edge, in-situ techniques now allows for investigation, understanding, and prediction of dynamic behavior of materials. Of particular interest, both for civilian and defense applications, is the interaction of dislocations with various classes of defects. In this study, high purity copper samples were implanted with helium ions of varying energy to create a ~10 μm thick surface layer rich in helium bubbles. While nano-mechanical testing of this surface layer revealed increasing hardness and yield strength with helium dose, Richtmyer-Meshkov instability (RMI) experiments carried out on identically implanted copper targets indicated no significant trends in material strength. Molecular dynamics (MD) simulations were preformed to observe (1) helium bubble evolution during dynamic loading and (2) dislocation interactions with pressurized helium bubbles versus dispersed helium atoms. Findings will be discussed both in terms of the discrepancy in copper behaviors and for potential applicability to other materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, Other |