Abstract
In this study, Ti–6Al–4V alloy was diffusion bonded to super-duplex stainless steel (SDSS) using an electrodeposited Cu interlayer containing alumina nanoparticles to determine the effects of bonding parameters on the microstructural evolution within the joint region. The results of the study showed that the homogeneity of the joint is affected by the bonding time and bonding temperature. The results also showed that when a Cu/Al2O3 interlayer is used, Ti–6Al–4V alloy can be successfully diffusion bonded to SDSS at temperatures above 850 °C. The combination of longer bonding time and high bonding temperature leads to the formation of various intermetallic compounds within the interface. However, the presence of the Al2O3 nanoparticles within the interface causes a change in the volume, size, and shape of the intermetallic compounds formed by pinning grain boundaries and restricting grain growth of the interlayer. The variation of the chemical composition and hardness across the bond interface confirmed a better distribution of hard phases within the joint center when a Cu/Al2O3 interlayer was used.
Highlights
Advanced alloys of titanium and stainless steel are widely regarded as high-strength, corrosion-resistant materials that find applications in industries such as biomedical, aerospace, automotive, and oil and gas.The growth in the demand for higher-performing multicomponent structures and mechanical systems necessitates the combination of these advanced alloys into superstructures containing multiple materials of uniquely differing chemical, thermal, and thermomechanical properties [1,2]
Ti–6Al–4V alloy was diffusion bonded to super-duplex stainless steel (SDSS) using an electrodeposited Cu interlayer containing alumina nanoparticles to determine the effects of bonding parameters on the microstructural evolution within the joint region
The results of the study showed that SDSS and Ti–6Al–4V can be successfully diffusion bonded using a Cu interlayer embedded with alumina nanoparticles at temperatures above 800 °C
Summary
Advanced alloys of titanium and stainless steel are widely regarded as high-strength, corrosion-resistant materials that find applications in industries such as biomedical, aerospace, automotive, and oil and gas.The growth in the demand for higher-performing multicomponent structures and mechanical systems necessitates the combination of these advanced alloys into superstructures containing multiple materials of uniquely differing chemical, thermal, and thermomechanical properties [1,2]. The welding of multiple components of structures is still an area that requires extensive research to identify technologies that are capable of welding dissimilar materials without adverse effects given the differences in the properties of the materials [7] Techniques such as friction stir welding (FSW) [8], friction stir spot welding (FSSW) [9], and ultrasonic welding (USW) [10] have shown potential for producing multicomponent structures; there still exist numerous limitations that constrain the successful application of these technologies in industry. There are two variants of the diffusion bonding process: The first is transient
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