高压物理学报2026，Vol.40Issue(6)：60-76,17.DOI:10.11858/gywlxb.20251200
高应变率作用下Nb3Sn复合超导体临界性能退化响应机理分析
Analysis of High-Strain-Rate Deformation Induced Degradation of Critical Properties in Nb3Sn Superconductors
摘要
Abstract
Nb3Sn superconductors are vital for advanced applications like particle accelerators and fusion devices,yet their performance degrades irreversibly under the high-strain-rate dynamic loads encountered during quench or fast excitation.This study integrates molecular dynamics simulations,continuum mechanics,and density functional theory to unravel the underlying multiphysics coupling mechanisms.We probe the elastoplastic response,adiabatic heating from plastic work,and damage evolution in Nb3Sn composites under high-strain-rate tension.Our analysis reveals that at cryogenic temperatures,the niobium matrix deforms via full-dislocation slip,whereas the brittle Nb3Sn coating fractures.The associated temperature rise,driven by plastic work dissipation and accumulating with strain,synergizes with deformation-induced damage(amorphization and cracking)to severely degrade superconducting properties.These damage mechanisms cause irreversible electronic structure changes,directly impairing super-conductivity.These findings establish a deformation-thermal-damage correlation mechanism,providing a theoretical foundation for the design of resilient superconducting devices.关键词
Nb3Sn/Nb复合超导体/高应变率/分子动力学/弹塑性变形解耦/温升/临界性能退化Key words
Nb3Sn composite superconductors/high strain rate/molecular dynamics/decoupling of elastic-plastic deformation/temperature rise/critical properties degradation分类
数理科学引用本文复制引用
菅长旭,杜侨依,丁贺,肖革胜,刘志芳,乔力..高应变率作用下Nb3Sn复合超导体临界性能退化响应机理分析[J].高压物理学报,2026,40(6):60-76,17.基金项目
国家自然科学基金(12502248,12272249,11772212) （12502248,12272249,11772212）
山西省基础研究计划(202303021211070,202203021212226) （202303021211070,202203021212226）
