| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components IV
|
| Presentation Title |
High temperature creep behavior of castable and sintered nanostructured alloys using the nanoindenation technique. |
| Author(s) |
Abhinav Sharma, Mingxi Ouyang, Jason R Trelewicz, David J Sprouster, Lance L Snead |
| On-Site Speaker (Planned) |
Abhinav Sharma |
| Abstract Scope |
In this work, we utilized the nanoindentation technique to understand the high-temperature creep behavior between two types of low-activation ferritic-martensitic steels: castable nanostructured alloy (CNA) and sintered nanostructured alloy (SNA). A series of nanoindents were performed on both alloys over the temperature range of 25 °C to 650 °C with a maximum load of 100 mN. The creep displacement indicates that creep behaviors in the sintered and cast materials are remarkably similar. The creep stress exponent (n) for CNA and SNA were found to be in the range of 8-35 and the activation volume obtained is ~14-42b^3,indicating a dislocation-dominated mechanism in both alloys. A decline in the creep stress exponent with increasing temperature is observed, attributable to the increased influence of thermally activated dislocations. This observed phenomenon suggests a potential transition in the deformation mechanism from dislocation glide towards a thermally activated dislocation process, significantly impacting the observed creep behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Mechanical Properties, High-Temperature Materials |