メカニカルインターロック構造を用いた異種金属積層における薄壁形状が接合強度に与える影響の調査

抄録

In recent years, the need to reduce CO2 emissions from transportation equipment in response to stricter global warming gas emission regulations has attracted attention to the use of dissimilar metal deposition of steel, the main structural material of automobiles, and Al alloys, which are widely used as lightweight metals. However, dissimilar metal deposition of steel and Al alloys have a problem that a brittle intermetallic compound layer (IMC) is formed at the interface, resulting in a decrease in bonding strength. In this study, we investigated the feasibility of improving the bonding strength between mild steel and Al alloys by using a mechanical interlock structure. Tensile test piece ruptured at values between 30 and 60 MPa. In the 10- and 20-layer cases, the mechanical interlock structure exceeded the tensile strength of the Al alloy. In the case of the 15-layer specimen, the mechanical interlock structure worked for about 25 mm, and the strength was 0.78 kN/mm.