Speaker
Description
Niobium (Nb) has long been recognized as the primary material for superconducting radio-frequency (SRF) cavities due to its excellent superconducting properties and mechanical formability. However, improving its structural stability under cryogenic operating conditions and high electromagnetic loads remains a key challenge. In this study, we employ molecular dynamics (MD) simulations to investigate the mechanical behavior of three candidate materials: single-crystalline niobium, low-alloyed Nb-Zr, and Nb-Mo systems. Each system is modeled as a cubic specimen subjected to 20 % uniaxial compression, and their mechanical responses are analyzed through stress-strain curves, dislocation evolution, and local atomic structure classification via Common Neighbor Analysis (CNA). Alloying effects on yield strength, plastic deformation mechanisms, and microstructural stability are systematically evaluated. The simulation results provide atomistic insights into how minor alloying additions influence defect formation and dislocation motion, which are critical factors in maintaining cavity performance under thermal and mechanical stress. This study aims to propose a guideline for alloy composition optimization in SRF cavity design by identifying compositions that enhance mechanical resilience while preserving favorable superconducting characteristics. The findings are expected to support the development of next-generation SRF cavity materials with improved durability and performance.
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