Abstract
The microstructure, interface reactions and mechanical properties of the Q345 steel/Al/Zr bonding interface were investigated. The thicknesses of the reaction layer in both Al/Fe and Al/Zr interfaces are temperature-dependent, with a higher temperature yielding a larger thickness. Both experimental results and thermodynamic calculation confirmed that the diffusion transition regions near the Al/Fe and Al/Zr interfaces mainly consist of Al5Fe2 and Al3Zr with thin Al3Fe and Al3Zr2 transitional phases, respectively. The growth kinetic equations of Al5Fe2 and Al3Zr as a function of temperature were investigated. The fitted curves from the equations well agree with the experimental results. The hardness of Al5Fe2 is higher than Al3Zr and the base materials. The propagation of shear crack occurs within Al5Fe2. Optimized shear strength can be obtained by controlling the thickness of reaction layer. The grain growth and fracture mechanisms of Al5Fe2 and Al3Zr at the interfaces were also discussed based on electron back scattering diffraction (EBSD) analysis of both reaction layers and fracture morphology.
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