| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Enthalpy as a Driver of Irradiation-Induced Amorphization and Crystallization in Nanostructured Materials |
| Author(s) |
Janelle P. Wharry, Soumita Mondal, Md. Ali Muntaha, Nathaniel Keninger, Sooyeon Hwang, Arya Chatterjee, Tristan Olsen, Cyrus Koroni, Sarah Pooley, Hui (Claire) Xiong |
| On-Site Speaker (Planned) |
Janelle P. Wharry |
| Abstract Scope |
This talk will present a new theory suggesting that enthalpy controls both irradiation-induced amorphization (IIA) and irradiation-induced crystallization (IIC). Intermetallic compounds and ceramics have long been known to undergo IIA, whereas athermal IIC is an emerging phenomenon. Previous attempts to develop unifying theories of both IIC and IIA have centered around entropic arguments with critical atomic displacements. But such theories require irradiation to increase configurational entropy for IIA and decrease configurational entropy for IIC, still precluding a truly unified theory. Here, we consider enthalpy to explain both IIA and IIC. Enthalpy and entropy are related through the free energy. By considering the role of enthalpic evolution during irradiation, we can predict the direction of IIA or IIC through the overall free energy change. This theory will be supported with experimental observations of IIA in immiscible Cu-Ta composites and MoSi precipitates, and IIC in several ceramics including TiO2, Nb2O5, and Al2O3. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Ceramics, Nuclear Materials |