Effect of Transverse Rolling Deformation on Microstructure and Performance of 7075-T6 Aluminum Alloy Sheets

doi:10.12068/j.issn.1005-3026.2025.20240185

Abstract

Abstract:

The 7075-T6 aluminum alloy sheets prepared by short flow process and conventional process were studied， and the influence of transverse rolling deformation in alternately rolling on the microstructure and performance of the alloy sheets was analyzed. The results show that as the transverse rolling deformation increases to 80% gradually， the streamline distribution characteristics of excess crystalline particles along the width direction of the alloy sheets strengthen， and the elliptical grains get finer. There is little change in the strength of the alloy sheets， and the elongation rate first increases and then remains unchanged. Alternately， rolling significantly improves the fatigue performance of aluminum alloy. When the transverse rolling deformation is 40%， the fatigue life of alloy sheets prepared by short flow process and conventional process is the longest， with 7.1×10⁶ cycles and 6.6×10⁶ cycles， respectively， which are 8.1 times and 9.3 times longer than that of sheets prepared by full longitudinal rolling process. The short flow process of ingots for direct hot rolling is beneficial for improving the elongation rate and fatigue performance of 7075 aluminum alloy sheets.

Key words: 7075-T6 aluminum alloy sheet, excess crystalline particle, alternately rolling, transverse rolling deformation, fatigue performance

CLC Number:

TG 142.1

Ni TIAN, Zhi-sen ZHANG, Pei-hong ZHANG, Tian-xiang ZHANG. Effect of Transverse Rolling Deformation on Microstructure and Performance of 7075-T6 Aluminum Alloy Sheets[J]. Journal of Northeastern University(Natural Science), 2025, 46(8): 140-148.

Figures/Tables 12

Table 1 Rolling processes of 7075 aluminum alloy ingot

热轧方式	每道次板材厚度/mm
全纵轧	纵轧55→48→40→33→27→24→20→15→11→8→5→3
变形量为27%横轧后再纵轧	横轧55→48→40 纵轧40→33→27→24→20→15→11→8→5→3
变形量为40%横轧后再纵轧	横轧55→48→40→33 纵轧33→27→24→20→15→11→8→5→3
变形量为56%横轧后再纵轧	横轧55→48→40→33→27→24 纵轧24→20→15→11→8→5→3
变形量为80%横轧后再纵轧	横轧55→48→40→33→27→24→20→15→11 纵轧11→8→5→3

Fig.1 Dimensional drawing of specimens for tensile and fatigue tests (unit:mm)

Fig.2 OM images of 7075-T6 aluminum alloy sheets prepared by two processes (sheet surface, non-etched)

Fig.3 SEM and mapping analysis of 7075-T6 aluminum alloy sheets (40% transverse rolling deformation) prepared by conventional process

Fig.4 OM images of grains in central layer of 7075-T6 aluminum alloy sheets prepared by two processes(longitudinal section)

Fig.5 TEM bright-field images of dispersed particles in 7075-T6 aluminum alloy sheets prepared by twoprocesses

Fig.6 TEM bright-field image and EDS analysis results of dispersed particles in 7075-T6 aluminum alloy sheets prepared by conventional process (full longitudinal rolling)

Fig.7 TEM bright-field images of precipitated particles in 7075-T6 aluminum alloy sheets prepared by twoprocesses and electron diffraction patterns of selected area along α-Al [110] zone axis

Fig.8 Tensile performance of 7075-T6 aluminum alloy sheets prepared by two processes

Fig.9 Fatigue life of 7075-T6 aluminum alloy sheets prepared by two processes

Fig.10 SEM images of fatigue crack sources of 7075-T6 aluminum alloy sheets prepared by two processes

Fig.11 SEM images of fatigue crack propagation zone of 7075-T6 aluminum alloy sheets prepared bytwo processes

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