PSI - Issue 65

I.S. Kamantsev et al. / Procedia Structural Integrity 65 (2024) 109–113 I.S. Kamantsev et al. / Structural Integrity Procedia 00 (2024) 000–000

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3. Results and discussion

The microstructure of the aluminum alloy 2024 sample in the initial state is represented by a solid solution of alloying components in the aluminum crystal lattice, as well as a nonequilibrium eutectic characteristic of this alloy along the grain boundaries in the form of continuous rims - Maltseva et al. (2019). The structure also contains precipitates of intermetallic phases S (CuMgAl2) and θ (CuAl2) (Fig. 1). The hardness in the initial state is 91 HV 0.05. Figure 2 shows an image of the microstructure of the sample after rolling.

Fig. 1 The microstructure of the aluminum alloy 2024 in the initial state.

Fig. 2 Micro structure of the aluminum alloy 2024 after rolling.

After the rolling operation, the material has a grain structure, which is strongly elongated in the rolling direction. The grain form factor is 2.6, the hardness is 97 HV 0.05. Table 2 shows the microstructures of the aluminum alloy 2024 samples after different annealing temperatures and with different holding times (1 and 2 hours), where the change in grain shape along the rolling direction is observed.

Fig. 3 The dependences of grain form factor and microhardness on annealing temperature of the aluminum alloy 2024. Fig. 3 shows the dependences of the grain form factor and microhardness values of the studied aluminum alloy 2024 on the temperature, as well as for different holding times - 1 or 2 hours.