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<p>This work presents a quantitative comparison of the precipitation evolution and mechanical response of a spray-formed Al-8.2Zn-2.0&#xa0;Mg-2.3Cu alloy subjected to single-step aging (T6), double-step aging (DSA), and triple-step aging (TSA) after identical extrusion and rolling treatments. The aim is to clarify how different aging paths regulate precipitate characteristics and thereby alter the strength–ductility trade-off in this specific processing state. TEM analyses show that the T6 condition contains the finest <i>η</i>′ precipitates and GP Ⅱ zones with the highest number density, whereas the DSA condition exhibits precipitate coarsening accompanied by partial transformation to the <i>η</i> phase. The TSA condition preserves a relatively high density of fine precipitates, although the average precipitate size is slightly larger than that of the T6 sample. Correspondingly, the T6 sample exhibits the highest ultimate tensile strength and yield strength (757 ± 15&#xa0;and 666 ± 15&#xa0;MPa), while the TSA sample retains 95.7% of the ultimate tensile strength and 96.1% of the yield strength of the T6 condition, together with an increased elongation from 12.4 to 13.7%. Quantitative strengthening analysis indicates that precipitation strengthening dominates the yield-strength difference among the three aging states. The results provide a microstructure-based interpretation of how multi-step aging modifies the balance between strength retention and ductility improvement in spray-formed Al-Zn-Mg-Cu alloys.</p>

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Effect of Aging Treatment on the Microstructure and Mechanical Properties of a Spray-Formed Al-Zn-Mg-Cu Alloy

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Caihe Fan,
  • Yuxuan Liu,
  • Huaqin Lv,
  • Qin Wu

摘要

This work presents a quantitative comparison of the precipitation evolution and mechanical response of a spray-formed Al-8.2Zn-2.0 Mg-2.3Cu alloy subjected to single-step aging (T6), double-step aging (DSA), and triple-step aging (TSA) after identical extrusion and rolling treatments. The aim is to clarify how different aging paths regulate precipitate characteristics and thereby alter the strength–ductility trade-off in this specific processing state. TEM analyses show that the T6 condition contains the finest η′ precipitates and GP Ⅱ zones with the highest number density, whereas the DSA condition exhibits precipitate coarsening accompanied by partial transformation to the η phase. The TSA condition preserves a relatively high density of fine precipitates, although the average precipitate size is slightly larger than that of the T6 sample. Correspondingly, the T6 sample exhibits the highest ultimate tensile strength and yield strength (757 ± 15 and 666 ± 15 MPa), while the TSA sample retains 95.7% of the ultimate tensile strength and 96.1% of the yield strength of the T6 condition, together with an increased elongation from 12.4 to 13.7%. Quantitative strengthening analysis indicates that precipitation strengthening dominates the yield-strength difference among the three aging states. The results provide a microstructure-based interpretation of how multi-step aging modifies the balance between strength retention and ductility improvement in spray-formed Al-Zn-Mg-Cu alloys.