摘要
Abstract
Metal-metal energetic structural materials(ESMs)possess unique thermal reaction characteristics combined with me-chanical strength,making them promising candidates for reactive fragment applications.Among them,Al-based ESMs have been extensively investigated due to their high energy-release potential.However,achieving a balance among strength,plasticity,and impact-induced energy release remains challenging,which limits their further development.In this study,Al/Zr/Bi2O3 ESMs with an Al/Zr molar ratio of 1.3∶1 and varying Bi2O3 contents were fabricated using a ball milling-spin forging process.Structural characterization,thermal analysis,quasi-static compression tests,and ballistic penetration experiments were systematically con-ducted.The results demonstrate that introducing an appropriate amount of Bi2O3 significantly enhances impact-induced chemical energy release while maintaining sufficient load-bearing capacity.Specifically,with Bi2O3 additions of 3%and 5%,the energy release at an impact velocity of 0.8 km·s-1 reached 6.26 kJ·g-1 and 7.07 kJ·g-1,respectively,which are approximately 2.8-3.15 times higher than that of the oxidant-free Al/Zr system(2.24 kJ·g-1).The velocity threshold for triggering a pronounced chemical reaction in this system was approximately 0.357 km·s-1.However,when the Bi2O3 content reached or exceeded 7%,severe oxi-dant agglomeration induced interfacial defects and material embrittlement,leading to premature fracture during impact and con-sequently suppressing the chemical reaction.Furthermore,the mechanisms by which Bi2O3 promotes Al/Zr interfacial reactions and enhances energy release were systematically analyzed.This work provides both experimental evidence and theoretical in-sight for the development of high-efficiency energetic structural materials through optimized oxidant content.关键词
含能结构材料/制备/冲击诱导能量释放/反应机理/Bi2O3添加量Key words
energetic structural materials/preparation/impact-induced energy release/reaction mechanism/Bi2O3 addition amount分类
军事科技
