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<p>This study systematically investigates the effects and mechanisms of preheating temperature (300-900&#xa0;K) on the thermodynamic behavior of self-propagating reactions in Ni/Al reactive multilayer nanofoils through a combination of experiments and molecular dynamics simulations. The results indicate that preheating temperature significantly influences the combustion wave propagation velocity and combustion temperature: Preheating markedly enhances the reaction kinetics, with the combustion wave velocity increasing sharply from 7.42&#xa0;m/s at 300&#xa0;K to 126.05&#xa0;m/s at 900&#xa0;K. However, the dissolution front temperature (Tc) exhibits a decreasing trend, dropping from 1600 to 1400&#xa0;K, primarily due to the formation of an interfacial premixing zone and alterations in diffusion behavior. Preheating leads to an increase in the thickness of the premixing zone, which results in the complication and prolongation of diffusion paths. Molecular dynamics simulations reveal the synergistic regulatory mechanism of preheating temperature and interfacial premixing on reaction kinetics, and for the first time, uncover the synergistic–competitive effects between preheating temperature and interfacial premixing. This research provides theoretical guidance for regulating the thermodynamic properties of self-propagating reactive multilayers and their applications in material joining.</p>

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Kinetics of Ni-Al Reactive Multilayer Nanofoil Self-propagating Reaction Driven by Preheating Temperature and the Interface Premixing Mechanism

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Zhen Hu,
  • Baolei Wu,
  • Mingkang Wang,
  • Weiyuan Yu

摘要

This study systematically investigates the effects and mechanisms of preheating temperature (300-900 K) on the thermodynamic behavior of self-propagating reactions in Ni/Al reactive multilayer nanofoils through a combination of experiments and molecular dynamics simulations. The results indicate that preheating temperature significantly influences the combustion wave propagation velocity and combustion temperature: Preheating markedly enhances the reaction kinetics, with the combustion wave velocity increasing sharply from 7.42 m/s at 300 K to 126.05 m/s at 900 K. However, the dissolution front temperature (Tc) exhibits a decreasing trend, dropping from 1600 to 1400 K, primarily due to the formation of an interfacial premixing zone and alterations in diffusion behavior. Preheating leads to an increase in the thickness of the premixing zone, which results in the complication and prolongation of diffusion paths. Molecular dynamics simulations reveal the synergistic regulatory mechanism of preheating temperature and interfacial premixing on reaction kinetics, and for the first time, uncover the synergistic–competitive effects between preheating temperature and interfacial premixing. This research provides theoretical guidance for regulating the thermodynamic properties of self-propagating reactive multilayers and their applications in material joining.