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<p>This study investigates the effect of cold deformation on the microstructure and properties of spray-formed Al-12.3Zn-2.2Mg-1.5Cu alloy with T9I4 treatment. Comprehensive characterization via TEM, hardness testing, wear experiments, intergranular corrosion, and electrochemical analysis revealed that cold deformation significantly refined the size and distribution of the precipitates. At 3% deformation (T93I4 treatment), the alloy exhibited minimized precipitate size, high dislocation density, and a dense dislocation network, which synergistically enhanced strength via the Orowan mechanism. The peak hardness reached 221.6 HV, representing a 5.37% increase compared to the undeformed sample (T6I4 treatment). Furthermore, deformation-induced dislocations promoted solute redistribution, broadening the precipitate-free zone (PFZ) and inducing discontinuous grain boundary precipitates (GBPs), thereby suppressing intergranular corrosion. Electrochemical tests confirmed superior corrosion resistance for the alloy after T93I4 treatment, evidenced by the lowest corrosion current density (0.0151&#xa0;mA/cm<sup>2</sup>) and highest polarization resistance. These findings demonstrate that 3% cold deformation combined with secondary aging optimizes precipitate morphology, dislocation density, and grain boundary characteristics, achieving a balance between mechanical strength and corrosion resistance.</p>

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Effect of Deformation Amount on Microstructure and Properties of Spray-Formed Al-12.3Zn-2.2Mg-1.5Cu Alloy with T9I4 Treatment

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Xinnan Li,
  • Fengyi Wang,
  • Ruiming Su

摘要

This study investigates the effect of cold deformation on the microstructure and properties of spray-formed Al-12.3Zn-2.2Mg-1.5Cu alloy with T9I4 treatment. Comprehensive characterization via TEM, hardness testing, wear experiments, intergranular corrosion, and electrochemical analysis revealed that cold deformation significantly refined the size and distribution of the precipitates. At 3% deformation (T93I4 treatment), the alloy exhibited minimized precipitate size, high dislocation density, and a dense dislocation network, which synergistically enhanced strength via the Orowan mechanism. The peak hardness reached 221.6 HV, representing a 5.37% increase compared to the undeformed sample (T6I4 treatment). Furthermore, deformation-induced dislocations promoted solute redistribution, broadening the precipitate-free zone (PFZ) and inducing discontinuous grain boundary precipitates (GBPs), thereby suppressing intergranular corrosion. Electrochemical tests confirmed superior corrosion resistance for the alloy after T93I4 treatment, evidenced by the lowest corrosion current density (0.0151 mA/cm2) and highest polarization resistance. These findings demonstrate that 3% cold deformation combined with secondary aging optimizes precipitate morphology, dislocation density, and grain boundary characteristics, achieving a balance between mechanical strength and corrosion resistance.