Air atmosphere diffusion bonding of Al–Mg–Li alloy using Cu nano-coating interlayer: Microstructural characterization and formation mechanisms

The Influence of Time, Atmosphere and Surface Roughness on the Interface Strength and Microstructure of AA6061–AA1050 Diffusion Bonded Components

“…These high pressures drop to 8–10 MPa only when the steady state temperature is reached. These values are in the same range as reported in previous studies [ 18 , 19 , 20 ]. Figure 14 shows that the pressure variation across the contact surface is small.…”

“…Diffusion bonding of aluminum alloys is greatly influenced by bonding conditions such as temperature, external pressure, holding time and surface roughness [ 14 ], but the major difficulty in the solid-state bonding of aluminum comes from its tenacious surface oxide film, which cannot be avoided under normal manufacturing conditions [ 3 , 6 , 17 , 18 ]. The oxide film prevents the close contact between base materials and acts as a diffusion barrier of alloying atoms, which results in poor bonding quality [ 19 , 20 ] and effective mechanical strength. The different process parameters that influence the bond strength of AA5083, AA6082 and AA7075 pairs was investigated in [ 21 ].…”

“…These results seem to somewhat contradict the trends observed in the previous studies. For example, it is reported in [ 20 ] that, for the same temperature and holding time, an increase in bonding pressure resulted in lower interface bond strength. It is also reported that increasing the bonding temperature to 400 °C and the holding time to 60 (min) at the same bonding pressure also resulted in lower interface bond strength.…”

Temperature Effect on Non-Vacuum Solid State Diffusion Bonded Joints of Al 2014

“…Solid-state diffusion bonding can be performed through either a controlled atmosphere or vacuum [4,5]. Diffusion bonding in a vacuum is costly and the equipment is complex in construction, also the time required for the complete process is more compared to the diffusion bonding performed in the atmosphere, but the formation of oxidation is the main obstacle for air diffusion bonding [6]. The combined pressure and temperature (0.5-0.8 Tm) are used to establish a sound joint at the interface of the metals.…”

“…Diffusion bonding of aluminum alloys in the atmosphere is a challenging task, as rapid oxide formation is always a hurdle. Electrodeposition of copper on aluminium surface is performed to reduce the oxidation [6]. Zinc cladding technology is also incorporated to inhibit oxide on aluminium surface and to improve the joint properties [12].…”