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<p>This study aims to systematically investigate the strengthening mechanisms of MgZn<sub>2</sub> precipitates in 7075 aluminum alloy through optimized heat treatment processes and multi-scale simulations. Various solution, aging, and cryogenic treatment regimes were designed and compared. The alloy’s properties and microstructure were characterized using hardness measurements, tensile tests, and SEM/TEM analysis. The results demonstrate that the optimal process incorporating cryogenic treatment significantly enhances the ultimate tensile strength to 627 MPa, superior to the conventional T6 temper (580 MPa). Microstructural observations confirmed that this process effectively promotes grain refinement and the uniform dispersion of <i>η</i>′ phase (MgZn<sub>2</sub>). First-principles calculations at the atomic–electronic scale revealed that the Al(111)/MgZn<sub>2</sub>(210) interface exhibits negative interfacial energy ( − 0.57&#xa0;eV/Å) and a high work of adhesion, indicating excellent thermal stability and bonding strength, which constitutes a key strengthening interface. Adsorption energy and elemental doping calculations further indicated that Mg sites at the interface preferentially adsorb OH, while Al sites favor O adsorption, and substituting Mg sites with doping elements more effectively enhances interfacial stability. This research provides a solid experimental and theoretical basis for developing high-performance 7075 aluminum alloys by synergistically tailoring processing parameters and interfacial microstructure.</p>

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Optimization of heat treatment process and enhancement of microstructure–property in 7075 aluminum alloy

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Kaitao Zheng,
  • Fan Xing,
  • Xiaoli Shi,
  • Dehong Lu

摘要

This study aims to systematically investigate the strengthening mechanisms of MgZn2 precipitates in 7075 aluminum alloy through optimized heat treatment processes and multi-scale simulations. Various solution, aging, and cryogenic treatment regimes were designed and compared. The alloy’s properties and microstructure were characterized using hardness measurements, tensile tests, and SEM/TEM analysis. The results demonstrate that the optimal process incorporating cryogenic treatment significantly enhances the ultimate tensile strength to 627 MPa, superior to the conventional T6 temper (580 MPa). Microstructural observations confirmed that this process effectively promotes grain refinement and the uniform dispersion of η′ phase (MgZn2). First-principles calculations at the atomic–electronic scale revealed that the Al(111)/MgZn2(210) interface exhibits negative interfacial energy ( − 0.57 eV/Å) and a high work of adhesion, indicating excellent thermal stability and bonding strength, which constitutes a key strengthening interface. Adsorption energy and elemental doping calculations further indicated that Mg sites at the interface preferentially adsorb OH, while Al sites favor O adsorption, and substituting Mg sites with doping elements more effectively enhances interfacial stability. This research provides a solid experimental and theoretical basis for developing high-performance 7075 aluminum alloys by synergistically tailoring processing parameters and interfacial microstructure.