摘要
The successful joining of carbon fiber-reinforced aluminum matrix(C_(f)/Al)composites and TC4 alloy can produce composite structure and meet the demands of lightweight in aerospace field.Up to now,few experimental researches have been reported on the joining of C_(f)/Al composites and TC4 alloy.In this study,the AgCu foils and Ni-Al-Zr compact were designed for the self-propagating high-temperature synthesis joining of these two materials.C_(f)/Al composites were joined with a reactive Ti plated on its joining surface.The typical microstructure of TC4/(AgCu/Ni-Al-Zr/AgCu)/Ti/C_(f)/Al joint was analyzed,and the effects of joining condition on microstructural evolution of the SHS joint were investigated.A thin reaction layer of Ni-Al-Ti intermetallic compounds was formed adjacent to the TC4 alloy.As a result,AgCu foils could reduce the effect of reaction heat on the substrates and improve the joint shear strength.When the thickness of AgCu foils reaches 150 lm,the Ni-Al-Zr interlayer mainly acts as auxiliary heat source.High joining pressure caused the active elements to diffuse into C_(f)/Al composites and weakened the shear strength of the joint.Finally,the joint shear strength could reach 36.4 MPa when the AgCu foils were 50 lm and the joining pressure was 2 MPa.
基金
the National Natural Science Foundation of China(Nos.51975149 and 51905055)
the Central Universities Project(No.2019CDXYCL0031)。
