Enhancing radiation tolerance by controlling defect mobility and migration pathways in multicomponent single-phase...

Area of Science:

• Materials Science
• Nuclear Engineering
• Aerospace Engineering

Background:

• Understanding the relationship between material properties and defect behavior is crucial for developing advanced materials.
• Radiation-tolerant materials are essential for the safety and progress of nuclear and aerospace applications.
• Traditional methods for mitigating radiation damage focus on microstructural and nanoscale features.

Purpose of the Study:

• To enhance radiation tolerance in equiatomic single-phase concentrated solid solution alloys.
• To suppress void formation at elevated temperatures.
• To elucidate the mechanism controlling enhanced radiation tolerance.

Main Methods:

• Investigated defect dynamics and void formation in concentrated solid solution alloys at elevated temperatures.
• Analyzed the depth distribution of defect clusters using advanced techniques.
• Employed atomistic computer simulations to understand defect behavior at the atomic level.

Main Results:

• Demonstrated a two-orders-of-magnitude suppression of void formation, significantly enhancing radiation tolerance.
• Identified a transition in interstitial defect cluster motion from one-dimensional to three-dimensional.
• Observed enhanced point defect recombination due to the altered defect motion.

Conclusions:

• Tailoring interstitial defect cluster motion is key to improving radiation tolerance in concentrated solid solution alloys.
• The findings provide critical insights into the mechanisms of radiation damage mitigation.
• Established design criteria for developing next-generation radiation-tolerant structural alloys for demanding applications.