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<p>The research study aims to investigate the impact of microstructure and texture evolution during multi-pass friction stir processing (MFSP) affecting the hardness and corrosion resistance of AA7075 alloy. Three specimens were produced on a 6-mm AA7075 plate using 1st, 2nd, and 3rd FSP passes at a constant tool speed of 900&#xa0;rpm and a traverse speed of 30&#xa0;mm/min. Transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) analyses revealed rod-shaped η' (MgZn<sub>2</sub>) precipitates and rotated cube textures in the stir zone, indicating dynamic recrystallization. Grain size refinement was observed, with the average size reducing from 13.09&#xa0;µm (base metal) to 1.72&#xa0;µm (1st pass), 2.07&#xa0;µm (2nd pass), and 1.33&#xa0;µm (3rd pass). The 2nd pass specimen exhibited the most uniform microstructure, highest texture intensity, and hardness of 109.5 HV<sub>0.3</sub>. In conclusion, hardness is increased by 73.5%, reaching 115.2 HV<sub>0.3</sub> after 1st pass. Corrosion resistance significantly improved, with the rate decreasing from 5.726&#xa0;mmy<sup>−1</sup> (base metal) to 5.5 × 10<sup>−6</sup>&#xa0;mmy<sup>−1</sup> (3rd pass). Grain boundary refinement, especially the increase in low-angle boundaries, promoted uniform oxide layer formation and reduced micro-galvanic effects. MFSP was found to substantially enhance both mechanical and corrosion properties, with the 2nd pass offering the most effective balance.</p> Graphical Abstract <p></p>

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Variant Response of Multi-pass Friction Stir Process on Evolution of Microstructure, Texture, Hardness, and Corrosion Behavior of AA7075

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Amos Thounaojam,
  • Abhijith Sahadevan,
  • Ashutosh Padhan,
  • Sunilkumar Dhasan

摘要

The research study aims to investigate the impact of microstructure and texture evolution during multi-pass friction stir processing (MFSP) affecting the hardness and corrosion resistance of AA7075 alloy. Three specimens were produced on a 6-mm AA7075 plate using 1st, 2nd, and 3rd FSP passes at a constant tool speed of 900 rpm and a traverse speed of 30 mm/min. Transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) analyses revealed rod-shaped η' (MgZn2) precipitates and rotated cube textures in the stir zone, indicating dynamic recrystallization. Grain size refinement was observed, with the average size reducing from 13.09 µm (base metal) to 1.72 µm (1st pass), 2.07 µm (2nd pass), and 1.33 µm (3rd pass). The 2nd pass specimen exhibited the most uniform microstructure, highest texture intensity, and hardness of 109.5 HV0.3. In conclusion, hardness is increased by 73.5%, reaching 115.2 HV0.3 after 1st pass. Corrosion resistance significantly improved, with the rate decreasing from 5.726 mmy−1 (base metal) to 5.5 × 10−6 mmy−1 (3rd pass). Grain boundary refinement, especially the increase in low-angle boundaries, promoted uniform oxide layer formation and reduced micro-galvanic effects. MFSP was found to substantially enhance both mechanical and corrosion properties, with the 2nd pass offering the most effective balance.

Graphical Abstract