| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
New Insights into the Impact of Hydrogen on Monotonic/Cyclic Plasticity in Nickel Single Crystal Based on Nanoindentation Investigation |
| Author(s) |
Siva Prasad Murugan, Abdelali Oudriss, Guillaume Hachet, Xavier Feaugas |
| On-Site Speaker (Planned) |
Siva Prasad Murugan |
| Abstract Scope |
The impact of hydrogen on the monotonic and cyclic plasticity of <001> oriented nickel single crystal was investigated using nanoindentation. Static and dynamic nanoindentations were performed on undeformed and pre-strained samples with and without hydrogen. The indented surfaces were analyzed by SEM-FIB, EBSD, and TEM to characterize the development of dislocation structures and any other defects and hence to establish the hydrogen-plasticity correlation near the surface. Hydrogen-induced impacts on maximum shear stress to activate dislocations, hardness, and elastic modulus were observed in the static nanoindentation experiment. The long-range internal stresses developed in the hydrogen charged samples during the dynamic nanoindentation were compared to the results of TEM (dislocation density) and cyclic micro-tensile test (effective and back stresses). A competition between cyclic hardening/softening was observed with and without hydrogen, attributed to the hydrogen-induced differences in the development of dislocation structures and subsequent internal stresses. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, Environmental Effects, Mechanical Properties |