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

TLDR

Understanding how intrinsic material properties influence defect dynamics is a key challenge, and radiation‑tolerant materials are essential for nuclear and aerospace applications. The study aims to enhance radiation tolerance by suppressing void formation in equiatomic single‑phase concentrated solid solution alloys and uncover the underlying mechanism via defect cluster depth analysis and atomistic simulation. The mechanism involves analyzing defect cluster depth distribution and performing atomistic simulations to reveal how defect mobility is controlled. The alloys suppress void formation by two orders of magnitude at high temperatures, and the improved swelling resistance arises from shifting interstitial defect cluster motion from long‑range one‑dimensional to short‑range three‑dimensional, enhancing point defect recombination and providing design criteria for future radiation‑tolerant alloys.

Abstract

Abstract A grand challenge in material science is to understand the correlation between intrinsic properties and defect dynamics. Radiation tolerant materials are in great demand for safe operation and advancement of nuclear and aerospace systems. Unlike traditional approaches that rely on microstructural and nanoscale features to mitigate radiation damage, this study demonstrates enhancement of radiation tolerance with the suppression of void formation by two orders magnitude at elevated temperatures in equiatomic single-phase concentrated solid solution alloys, and more importantly, reveals its controlling mechanism through a detailed analysis of the depth distribution of defect clusters and an atomistic computer simulation. The enhanced swelling resistance is attributed to the tailored interstitial defect cluster motion in the alloys from a long-range one-dimensional mode to a short-range three-dimensional mode, which leads to enhanced point defect recombination. The results suggest design criteria for next generation radiation tolerant structural alloys.