When quenched at 480℃ and 490℃, 2CuAl in binary eutectic and S phase (CuMgAl2) and CuAl2 in ternary eutectic began to solid melt. When the imported aluminum plate is quenched at 500.33℃, the solid melting of CuAl2 _ 2 in binary eutectic becomes more obvious, the content of constituent phases decreases correspondingly compared with that at low temperature, and the phase boundary becomes smooth. When quenched at 504.98℃, the strengthening phase decreased and a slightly burnt structure appeared. With the continuous increase of temperature, the solid melting is more complete, the main strengthening phases are significantly reduced, the microstructure changes obviously, and eutectic and local grain boundary remelting, molten phase spheres and overburning triangles appear in the alloy

The higher the quenching temperature, the more obvious the overburning characteristics. After quenching at 504.98℃, the microstructure is slightly burnt, and the mechanical properties Z of the alloy after quenching at this temperature are high. Although the S(CuMgAl2) phase has been fully solid-melted and CuAl2 phase has been obviously solid-melted, the strengthening effect of the alloy matrix is still major, so the mechanical properties of the alloy have not been reduced, but have been improved until the peak. When the grain boundary appears obvious coarsening and overburning triangle, the mechanical properties are obviously reduced. 

The reason why the properties lag behind the microstructure is that 2024 aluminum alloy is an age strengthening alloy. The higher the quenching temperature, the better the age strengthening effect after quenching. If the holding time is interrupted, the strengthening phase will not be fully dissolved. Although it exceeds the ternary eutectic temperature, the alloy has not reached the saturation limit. Therefore, slight overburning not only does not reduce the tensile strength and elongation of the material, but also improves it, so that its fatigue performance is obviously reduced. When heated to 525℃ and kept for 6min and 12min, CuAl2 _ 2 phase was fully solid-melted, and a hard and brittle strengthening phase was precipitated, causing precipitation strengthening. Therefore, the metallographic structure of 2024 aluminum alloy must be inspected after quenching. [8] From the above data analysis, we can see that there are deviations from the literature in our experimental operation. Theoretically, near the eutectic temperature point of 2024 aluminum alloy, Z should be the ideal performance, that is, the hardness should reach Z. Then, with the increase of temperature, the over-burning phenomenon will affect the comprehensive properties of the alloy. It is the phenomenon that the hardness decreases after 500℃ in the data.

For the phenomenon that the hardness of Z is high at 480℃, and the hardness decreases directly with the increase of temperature, the personal summary makes the following assumptions: 1. Due to the complex experimental environment, all indicators failed to meet the standard of correct experiment, so some misoperation occurred in preparation and operation, which made the prepared raw materials fail to meet the technical parameters requirements of standard 2024 aluminum alloy. Then there is a data error; 2. Because the prepared samples are rough and uneven, there are technical deviations in the performance test, and there are wrong operations in the hardness determination process, which makes the results abnormal. Based on the analysis of the above experimental data, we get the following conclusion: only when the experimental parameters are corrected, and under the correct operation and ideal environment, can we get valuable experimental data. There are technical deviations in the experimental data, which cannot objectively reflect the performance specifications of 2024 aluminum alloy. It is necessary to re-evaluate the effect of solid solution temperature on the microstructure and properties of imported 7075 aluminum alloy after many times and a lot of experimental operations. However, it does not rule out the practical significance of the experimental data. It may be helpful to correct the wrong views of predecessors, but we can't make a hasty judgment just by one experiment, and more experiments are needed to analyze and demonstrate it in the future.

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