Al基钎料优化设计与脆性化合物及气孔缺陷生长机制原位研究进展OA

Aluminum alloy heterogeneous components connected via brazing technology are considered an important development direction in high-end manufacturing due to their good corrosion resistance,excellent thermal and electrical conductivity.However,conventional Al-based brazing fillers face issues such as relatively high melting points,insufficient wettability,and inadequate joint strength,while conventional brazing processes also suffer from challenges like difficulty in controlling brazing filler dosage,susceptibility to moisture absorption leading to failure,environmental pollution,and poor welding consistency.By performing compositional design on Al-Si and Zn-Al brazing fillers through eutectic multi-component systems,rare earth elements,and active elements,it is possible to lower the melting point,refine the microstructure,enhance performance,and improve joint properties.Utilizing composite brazing material forms such as laminated composite brazing materials,surface coatings on base materials,flux-cored and flux-coated brazing materials,and composite brazing pastes can enhance the mechanical properties,reliability,and process stability of brazed joints.Furthermore,the use of synchrotron radiation X-ray imaging technology to reveal the growth and morphological evolution mechanisms of complex brittle compounds and hydrogen porosity defects provides critical support for regulating joint microstructure and performance.Future research should leverage AI to empower the development of new brazing materials,conduct in-situ studies on brazing theory under extreme conditions,and achieve automated,intelligent online control of the brazing process.