About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Interface Structure and Properties: Impact on Microstructure Evolution
|
| Presentation Title |
Room-temperature recrystallization of molybdenum induced by nanoindentation |
| Author(s) |
Feitao Li, Afnan Mostafa, Niaz Abdolrahim, Eugen Rabkin |
| On-Site Speaker (Planned) |
Eugen Rabkin |
| Abstract Scope |
We performed nanoindentation on Mo single-crystal (SC) and polycrystalline (PC) samples utilizing a spheroconical indenter. Load-displacement curves of SC samples exhibited characteristic pop-in indicating an abrupt transition from elastic to plastic deformation at the maximum elastic shear stress of 12-16 GPa. Much weaker pop-ins were observed in the PC sample, with the maximum shear stress being below 0.5 GPa. The cross-sectional transmission electron microscopy of the indented area in SC samples revealed new near-surface grains when the loading was terminated manually immediately after the pop-in event. No new grains could be observed in the PC sample, indicating that the pop-in and recrystallization are correlated. The observed room-temperature recrystallization is in strong contrast with the behavior of heavily deformed bulk Mo that recrystallizes at temperatures above 900 °C. Our atomistic molecular dynamics simulations demonstrate how the newly formed polycrystalline structure annihilates when the nanoindentation is continued beyond the pop-in event. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Mechanical Properties, Thin Films and Interfaces |