Radiation endurance in Al₂O₃ nanoceramics.

Area of Science:

• Materials Science
• Nuclear Engineering
• Nanotechnology

Background:

• Advanced nuclear systems require materials resistant to high temperatures, corrosive environments, and radiation damage.
• Oxide nanoceramics offer potential solutions due to nanomaterial radiation tolerance and ceramic chemical stability.

Purpose of the Study:

• To investigate the radiation tolerance of aluminum oxide (Al2O3) thin films under varying damage levels at 600°C.
• To understand the evolution of structural features, mechanical properties, and impact response in irradiated Al2O3 films.

Main Methods:

• Utilized thin films as a model system to study oxide nanoceramics.
• Exposed Al2O3 thin films to irradiation at 20, 40, and 150 displacements per atom (dpa) at 600°C.
• Analyzed structural changes, mechanical properties (hardness), and response to impact loading.

Main Results:

• Irradiation induced crystallization of the amorphous phase and subsequent grain growth in Al2O3 films.
• Crystallization enhanced hardness, while grain growth led to softening, consistent with the Hall-Petch effect.
• Irradiated films exhibited enhanced energy dissipation mechanisms (twinning, lattice plasticity, amorphization) under impact loading compared to as-deposited films.

Conclusions:

• Al2O3 thin films demonstrate significant radiation tolerance and evolving mechanical properties under irradiation.
• Crystallization and grain growth alter mechanical behavior, with twinning playing a role in energy dissipation.
• Irradiated Al2O3 films possess superior energy dissipation capabilities for impact loading, highlighting their potential for nuclear applications.