Microstructural Evolution of a 3003 Based Aluminium Alloy during the CSET Process

Area of Science:

• Materials Science
• Metallurgy
• Mechanical Engineering

Background:

• Severe plastic deformation (SPD) is crucial for enhancing metal properties.
• Existing SPD techniques have limitations in producing specific geometries like tubes.
• The 3003 aluminum alloy is a widely used material with potential for property improvement.

Purpose of the Study:

• To investigate the microstructural evolution of a 3003 aluminum alloy using a new SPD technique called complex shearing of extruded tube (CSET).
• To evaluate the effectiveness of CSET in grain refinement and microhardness enhancement.
• To analyze the contributions of individual CSET processes to the overall strain.

Main Methods:

• Application of the complex shearing of extruded tube (CSET) technique, involving extrusion, Equal Channel Angular Pressing (ECAP), and torsional straining.
• Microstructural analysis using light microscopy, electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM).
• Microhardness testing to quantify changes in mechanical properties.

Main Results:

• The CSET technique successfully refined the grain size of the 3003 aluminum alloy to an average of 0.4 µm.
• Microhardness increased significantly from an initial 40 HV to a final 120 HV.
• Detailed microstructural changes during partial CSET processes were observed and analyzed.

Conclusions:

• The CSET technique is a highly effective method for producing fine-grained tubular structures in aluminum alloys.
• CSET offers a promising route for significantly enhancing the mechanical properties of metallic materials.
• The study provides valuable insights into the microstructural mechanisms governing CSET processing.