Abstract
Using Cu pipes and molten Al as the substrate metal and cladding metal respectively, the bonding mechanism of the solid-liquid cast-rolling bonding (SLCRB) process to fabricate bimetallic clad pipes was investigated through the experiment and simulation. The interface evolution of the cast-rolling area was obtained using oxide as the tracer and a thermal-mechanical coupling model was established to obtain the temperature and pressure distribution. Results indicate that it is a progressive contact behavior of the bonding interface in the cast-rolling area. The deformation is mainly along the rolling direction (RD), along with the metal flow from the normal direction (ND) side to transverse direction (TD) side. The ideal and complete interface evolution process of the SLCRB process can be subdivided into four stages including eight sub-processes: solid-liquid contact heat-exchange stage, solid-semisolid cast-bonding stage, solid-solid hot roll-bonding stage, solid-solid diffusion welding stage. Therefore, the SLCRB process is the synthetic action combining the diffusion, reaction, mechanical interlocking, roll-bonding etc. More generally, the interface evolution in practice is closely related to the physicochemical properties of substrate/cladding materials and the interaction mechanical behavior under high temperature. And it is usually a reasonable combination of some of these sub-processes.
Published Version
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