Ti6Al4V alaşımının gümüş aratabaka kullanılarak difüzyon kaynağı ile birleştirilebilirliği

In this study, pair of Ti6Al4V alloy joined by diffusion welding method using Ag interlayer and the effect on the connections of the welding temperature was investigated. Today, a Ti areas increase on metal- materials industry. Titanium is an element that has high degree of formability property, low density (4.54 g / cm3). Non-magnetic Ti has a higher melting temperature than steel. Ti and its alloys to have high strength, good toughness, low density, biocompatibility and good corrosion resistance properties, such as the due to the space industry and has considerable utility in applications where high performance is required. Therefore, the present study has been used widely used alloy of Ti Ti6Al4V alloy. Studies showed that the resultant joints were composed of Ti substrate, Ti-Ag sold solution. TiAg intermetallic phase, the remnant Ag interlayer, indicating that the TiAg intermetallic phase exhibits no detrimental effect on the strength of the joints. Therefore Ag interlayer is used as an interlayer. Diffusion bonding facilitates the joining of materials to produce components with no abrupt discontinuity in the microstructure and with a minimum of deformation. The process depends on a number of parameters, in particular, bonding temperature, atmosphere, time, pressure, and surface roughness. General alloying problems (brittle phase formation and limited mutual solubility), large difference between the melting points, the differences in thermal conductivity of parent metals, the carbon migration and oxidation are known as principal factors influencing joint integrity of dissimilar metal fusion welding. Within the confines of diffusion bonding mechanism, problems of fusion welding as previously indicated, can be eliminated in dissimilar metal joints. Most combinations of dissimilar metals can be joined by solid-state bonding methods although the alloying between these metals is insignificant. In the study, diffusion welding was carried out diffusion welding apparatus that specially designed constant bonding pressure of 5 MPa, 60 min at constant time and at 750-850 and 950 °C temperature on argon atmosphere. Bonding temperature is chosen as variable parameter. Welding pressure and welding time is kept constant .Samples were kept in the furnace until the furnace temperature drops to 250 °C, then they were kept at room temperature until cool. Furthermore microhardness test was applied in order to observe the changes in the interface to the samples. In order to see the hardness changes in bonding interfaces, sample No. S3 device with Leica MHF-10 (0.05 HV) under 50 g load, hardness measurements were carried out at 50 μm range Microstructure changes that occurred after welding were examined by optical microscope and EDS analysis were performed for element transition in source interface and the determination possible gas. After originated from experiments and investigations, it was observed in all samples of the unrelated. Better than a welded joint in parallel with increased duration was seen to be achieved and has determined that the best connection quality of welded S3 samples that was welding 950 °C temperature. Ag diffusion was observed at rates ranging between 100-140μm towards on the main material for all sample. Ti86Ag7, Ti516Al65Ag78V19, Ti8AgTi10Ag, Ti35Al4Ag4V, Ti463Al53Ag25V19, Ti8Ag and Ti66Al17phases were found to be intense in all specimens according to XRD analysis.