Abstract
In this work, effect of solution treatments on the microstructures and mechanical properties of industrial 7050 aluminum alloy thick plate was investigated by tensile test, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and transmission electron microscopy (TEM). The results show that the area fraction of residual phases decreases with increasing solution temperature from 475°C to 500°C. The overheating phenomenon identified by compound melting ball and crystal separating phase was observed at a temperature of 485°C or above. The compound melting balls are composed of S(Al2CuMg) phase dissolved with Zn atoms and Al matrix. The crystal separating phase is consisted of Al2Cu phase and the amorphous structure containing solute atom Mg. The maximum tensile strength of 529 MPa was obtained for the alloy solution treated at 475°C for 3h followed by peak aging at 120°C for 24h.
Highlights
The 7050 aluminum alloy thick plates have been widely used as structural components in aerospace industries due to good combination of the strength and toughness [1]
This study has been performed on the effect of solution temperature on the microstructure and mechanical properties of hot rolled 7050 aluminum alloy plate after subsequent peak aging
The following conclusions may be drawn: (1) The area fraction of residual phases gradually decreases with the increase of the solution temperature from 475oC to 500oC
Summary
The 7050 aluminum alloy thick plates have been widely used as structural components in aerospace industries due to good combination of the strength and toughness [1]. After homogenization treatment and thermomechanical processing, the resolvable residual phases are Mg(Zn,Mg,Cu), S(Al2CuMg) [9, 10] These residual phases can degrade the effect of age-hardening and aid crack initiation and propagation. A large number of studies have been carried out on the effect of solution temperature on the microstructure and mechanical properties of 7050 aluminum alloys [15, 16]. A suitable solution temperature can maximize to re-dissolve the residual phases, which has an important effect on obtaining good comprehensive mechanical properties. At the same time, understanding the effects of different degrees of overheating on the microstructure and mechanical properties of alloys can provide a reference for optimizing solid solution parameters. The effect of different solution temperatures on the microstructure and mechanical properties of 7050 alloy is investigated, including statistics of residual phases, phase evolution, and tensile properties testing. A variety of microanalysis methods are used to systematically study the microstructure of overheating
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