Abstract
In this study, using the diffusion welding method, welded joints were created with AlMg3/SiCp composite materials, and the mechanical strengths of these joints were examined. The AlMg3/SiCp composite specimens were cut out of plates produced directly with semi-solid stir-squeeze casting and contained 10% SiCp and 20% SiCp reinforcement. To examine the effects of reinforcement ratios on joint strength, specimen couples with the same and different reinforcement ratios were created. To examine the effects of different welding pressures on joint strength, by keeping the welding temperature constant at 580°C, welding was achieved under 3 different pressures as 1.5 MPa, 2.5 MPa and 3.5 MPa. By determining the mechanical strengths of the welded joints that were formed by shear test, the effects of reinforcement ratios and welding pressures on joint strength were investigated. As a result of the shear tests applied on the welded specimens, in the specimens that were diffusion-welded, welding quality decreased based on increasing reinforcement ratios, but as the amount of pressure and application duration increased, joint strength increased. As the SiC ratio increased in the joint zones, diffusion became difficult, and weak joints were occurred. The microscopic structure of the joint zone was examined by using optical microscopy and scanning electron microscopy (SEM) .It was seen that diffusion welding could be successfully performed in bonding SiCp-reinforced aluminum composites if the suitable welding pressure and duration are selected.
Highlights
Metal matrix composite (MMC) materials are advanced materials that have increasing usage rates in almost all industrial fields, especially defence, automotive and aviation [1,2,3]
In solid-state welding methods where melting does not take place, it is aimed for the materials to be bonded to preserve their structures and properties before the welding process, while the welding parameters in the diffusion bonding/welding method are temperature, pressure, duration of pressure application and atmosphere, welding zones with adequate mechanical properties may be obtained by providing the optimum values, and this method may be used to bond MMCs according to the reports in the literature [15,16,17,18,19,20,21,22,23]
Composite specimen couples with the same and different reinforcement ratios were prepared from AlMg3/SiCp composite blocks, and the prepared specimens were subjected to diffusion welding at the temperature of 580°C and under pressures of 1.5 MPa, 2.5 MPa and 3.5 MPa
Summary
Metal matrix composite (MMC) materials are advanced materials that have increasing usage rates in almost all industrial fields, especially defence, automotive and aviation [1,2,3]. In bonding applications of particle-reinforced composite materials with fusion welding, different densities of the reinforcement material and the matrix material lead to separation of the matrix material that goes into a liquid form and the reinforcement materials in various forms, failure of achieving the reinforcement distribution before the welding process and formation of segregation zones [8, 9]. Problems such as formation of unwanted reaction products due to processing temperatures higher than the melting temperature, uncontrolled solidifications that form during cooling or cracking of welding zones by excessive reduction of the ductility of the material are frequently encountered [10,11,12,13,14]. To determine the effects of reinforcement ratios on joint strength, shear and microhardness tests were applied, and the microstructures of the bonded-welded joints were examined by optical microscopy and SEM
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