Abstract
The Al–Li alloy is becoming popular for aerospace application owing to their low density, high specific strength, good corrosion resistance, etc. The diffusion bonding/superplastic forming (DB/SPF) structure of titanium alloy has been widely used in the aerospace industry. In order to broaden the application of Al–Li alloy, it is necessary to develop its diffusion bonding and superplastic forming (DB/SPF) technology. In the present study, diffusion bonding of 1420 Al–Li alloy assisted by pure aluminum foil was conducted on Gleeble-3500 thermal simulation system under different bonding parameters, the results show that the bonding temperatures have direct influence on the interface microstructure and bond strength of joints. Meanwhile, when the pure aluminum interlayer was introduced into the diffusion bonding process, the alloying element diffusion across the bond can improve the interface integrity and the mechanical properties. The joint formation mechanism with interlayer was investigated in detail, the development and application of this method was explored.
Highlights
The Al–Li alloy has become a promising member of aerospace used aluminum alloys due to its low density, high specific strength, good corrosion resistance, and excellent superplastic forming performance [1,2,3]
According to our precious studies [18,19], the effect of active alloying element macroscopic plastic during deformation to break theofcontinuous oxide alloys film; (2). Liquid phase such as magnesium diffusion bonding aluminum-based hastransient been investigated, the diffusion bonding with. This method needs a longer time to obtain a uniform results show that the alloying elements diffusion and the interfacial reaction between Mg and Al2 O3 bond joint; (3) the liquid Ga in room temperature to remove the surface oxide film and fulfill the are beneficial to the bonding quality
In our previous of active alloying element such as magnesium during diffusion bonding of aluminum-based alloys study, the active alloying element Mg can react with the oxide film and modify its characteristic and has been investigated, the results show that the alloying elements diffusion and the interfacial improve the bond quality effectively, the diffusion bonding of 1420 Al–Li alloy assisted by the pure reaction between Mg and Al2O3 are beneficial to the bonding quality
Summary
The Al–Li alloy has become a promising member of aerospace used aluminum alloys due to its low density, high specific strength, good corrosion resistance, and excellent superplastic forming performance [1,2,3]. Liquid phase such as magnesium diffusion bonding aluminum-based hastransient been investigated, the diffusion bonding with Cu as interlayer, this method needs a longer time to obtain a uniform results show that the alloying elements diffusion and the interfacial reaction between Mg and Al2 O3 bond joint; (3) the liquid Ga in room temperature to remove the surface oxide film and fulfill the are beneficial to the bonding quality. Based on the previous study above, from the point of view to improve the interface bond quality, the following service condition; (4) solid-state diffusion bonding assisted with Zn or Cu while the the pure Al interlayer with excellent plasticity and an alloying element concentration gradient between intermetallic formed and caused brittle fracture. The microstructure thickness of 2.2 mm, has a density of 2.47ofg/cm of the Tableand
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