Abstract
The two-sheet hollow structure of the 1420 Al-Li alloy was prepared by the method of superplastic forming and diffusion bonding. The interface combination status of the diffusion bonding region and the microstructure of the superplastic forming region were observed by an optical microscope. The thickness distribution of the superplastic forming region was measured by an ultrasonic thickness meter machine, the defect detection was tested by X-ray nondestructive inspection, and the failure modes of the samples were analyzed. The results showed that the two-sheet hollow structure of the 1420 Al-Li alloy was prepared successfully, the structure was integrated, and there were no shape defects such as pit, wrinkle, and collapse. The structure shape was almost attached to the die completely, and the thickness was almost uniform distribution. The no deforming area of the two-sheet hollow structure of the 1420 Al-Li alloy was a long strip, rolled microstructure, while the grains near the round corner area were equiaxed states resulting from dynamic recrystallization. The improper control of the superplastic gas pressure in the forming process would lead to the tearing or the die-attaching failure for the two-sheet hollow structure of the 1420 Al-Li alloy.
Highlights
Academic Editor: Hardy MohrbacherAs an advanced light alloy, Al-Li alloys have a series of advantages, such as low density, high modulus, high specific strength, high specific stiffness, good corrosion resistance, and superplasticity [1,2,3,4]
There were no stomachs and inclusions on the diffusion bonding area and no wrinkles and adhesion on the superplastic forming area, as shown in Figure 7, which means good diffusion bonding quality between the two sheets and good superplastic forming. It means that the two-sheet hollow structure of the 1420 Al-Li alloy was prepared successfully, with the diffusion bonding parameters of gallium interlayer thickness
The two-sheet hollow structure of the 1420 Al- Li alloy is a typical structure urgently needed by flying weapon equipment, and Superplastic forming and diffusion bonding (SPF/DB) is a special forming method with almost no allowance, low cost, and high efficiency
Summary
As an advanced light alloy, Al-Li alloys have a series of advantages, such as low density, high modulus, high specific strength, high specific stiffness, good corrosion resistance, and superplasticity [1,2,3,4]. Due to these advantages, the Al-Li alloys have great application prospects in modern aircraft and aerospace vehicles. The weight of aircraft components made of Al-Li alloys can be reduced by 10~15% compared with that made of conventional aluminum alloys.
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