Critical Rolling Process Parameters for Dynamic Recrystallization Behavior of AZ31 Magnesium Alloy Sheets

Area of Science:

• Materials Science
• Metallurgy
• Materials Engineering

Background:

• AZ31 magnesium alloy is crucial for lightweight applications.
• Understanding dynamic recrystallization (DRX) is key to controlling its mechanical properties.
• Texture evolution significantly impacts the formability and performance of magnesium alloys.

Purpose of the Study:

• To investigate the influence of rolling temperature and thickness reduction on AZ31 magnesium alloy's DRX behavior.
• To analyze the texture variation controlled by DRX.
• To identify optimal processing parameters for improved microstructure and properties.

Main Methods:

• Experimental investigation of rolling temperatures and thickness reductions.
• Analysis of dynamic recrystallization (DRX) phenomena.
• Texture analysis using X-ray diffraction or electron backscatter diffraction.

Main Results:

• DRX behavior, when optimized with rolling parameters, refines grain size and improves microstructure homogeneity.
• Critical parameters identified: 400°C-30%, 300°C-30%, and 250°C-40% reduction.
• DRX significantly reduces basal texture intensity compared to twinning, with subsequent texture evolution during grain growth.

Conclusions:

• Matching rolling temperature and thickness reduction is vital for effective grain refinement and microstructure homogeneity via DRX.
• The study identified critical processing windows for AZ31 sheets.
• Texture evolution during DRX and subsequent grain growth influences the final texture state and material properties.