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Microstructural Evolution of Cold-Rolled AA7075 Sheet during Solution Treatment.

Lu Wang^1,2, Xiaofang Yang^1,3, Joseph D Robson²

¹International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.

Materials (Basel, Switzerland)

|June 21, 2020

Summary

This summary is machine-generated.

Heating rate significantly impacts AA7075 alloy microstructure during solution treatment. Faster heating yields finer grains, while slower heating enhances texture, influencing anisotropy in tensile properties.

Keywords:

Al-Zn-Mg-Cu alloy dissolution heating rates pinning effect recrystallization

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Area of Science:

Materials Science
Metallurgy

Background:

Cold-rolled AA7075 alloy is crucial for aerospace applications.
Understanding microstructural evolution during heat treatment is key to optimizing properties.

Purpose of the Study:

To investigate the effect of heating rate on the solution heat treatment of AA7075 alloy.
To correlate microstructural changes with resulting material properties.

Main Methods:

Electrical conductivity measurements.
Microscopy techniques: Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM).
Crystallographic analysis: X-ray Diffraction (XRD), Electron Backscatter Diffraction (EBSD).

Main Results:

Soluble phases dissolve during heating, with dissolution kinetics influenced by heating rate.
Both fast and slow heating produce recrystallized and elongated grains; faster heating results in finer grains.
Slower heating leads to stronger {111}<110> and recrystallization textures, causing tensile property anisotropy.

Conclusions:

Heating rate is a critical parameter controlling grain size and texture development in AA7075 during solution treatment.
Microstructural anisotropy, driven by texture, affects tensile properties after artificial aging.