Scholarlink

<p>In this work, a self-designed highly alloyed Al-11.40Zn-2.98Mg-1.10Cu-0.03Sr-0.14Zr-0.15Sc alloy was employed to systematically evaluate the influence of three solution treatment strategies on its microstructural evolution, mechanical performance, and corrosion resistance. Comprehensive characterization using OM, SEM, XRD, and EBSD—together with tensile testing and intergranular/exfoliation corrosion assessments—was conducted to compare the effects of single-stage solution treatment (G1), conventional multi-stage solution treatment (G2), and a pre-recovery multi-stage solution treatment (P-MST, G3). The results demonstrate that the P-MST route (250&#xa0;°C × 12&#xa0;h + 350&#xa0;°C × 12&#xa0;h + 450&#xa0;°C × 2&#xa0;h + 460&#xa0;°C × 2&#xa0;h + 470&#xa0;°C × 2&#xa0;h) provides the most effective overall enhancement. The pre-recovery treatment significantly reduces the volume fraction of coarse second phases, increases the degree of solute dissolution, and promotes the uniform precipitation of fine Al<sub>3</sub>(Sc, Zr) and η′ phases during aging. The resulting supersaturated solid solution and refined grain structure lead to substantial improvements in mechanical properties and corrosion resistance. Relative to the G1 alloy, the G3 alloy exhibits increases in yield strength, ultimate tensile strength, and elongation from 758.3, 793.1&#xa0;MPa, and 3.1% to 777.1, 811.5&#xa0;MPa, and 4.5%, respectively. Hardness is enhanced from 205.9 to 222.4&#xa0;HV, corresponding to an increase of approximately 8.0%. The G3 alloy also shows markedly improved resistance to intergranular corrosion (maximum depth reduced by 45.1%) and achieves an exfoliation corrosion rating of EB. Quantitative strengthening analysis indicates that solid solution, grain boundary, and dislocation strengthening contribute approximately 11.57, 6.24, and 8.87&#xa0;MPa to the yield strength, respectively.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Novel Solution Treatments for Microstructure and Property Regulation of Ultra-High-Strength Highly Alloyed Al-Zn-Mg-Cu-Zr-Sc Aluminum Alloys

  • 期刊论文

  • 发表日期：

    2026年2月6日

查看全文
  • Yu Li,
  • Can Li,
  • Deli Kong,
  • Xiaojing Xu

摘要

In this work, a self-designed highly alloyed Al-11.40Zn-2.98Mg-1.10Cu-0.03Sr-0.14Zr-0.15Sc alloy was employed to systematically evaluate the influence of three solution treatment strategies on its microstructural evolution, mechanical performance, and corrosion resistance. Comprehensive characterization using OM, SEM, XRD, and EBSD—together with tensile testing and intergranular/exfoliation corrosion assessments—was conducted to compare the effects of single-stage solution treatment (G1), conventional multi-stage solution treatment (G2), and a pre-recovery multi-stage solution treatment (P-MST, G3). The results demonstrate that the P-MST route (250 °C × 12 h + 350 °C × 12 h + 450 °C × 2 h + 460 °C × 2 h + 470 °C × 2 h) provides the most effective overall enhancement. The pre-recovery treatment significantly reduces the volume fraction of coarse second phases, increases the degree of solute dissolution, and promotes the uniform precipitation of fine Al3(Sc, Zr) and η′ phases during aging. The resulting supersaturated solid solution and refined grain structure lead to substantial improvements in mechanical properties and corrosion resistance. Relative to the G1 alloy, the G3 alloy exhibits increases in yield strength, ultimate tensile strength, and elongation from 758.3, 793.1 MPa, and 3.1% to 777.1, 811.5 MPa, and 4.5%, respectively. Hardness is enhanced from 205.9 to 222.4 HV, corresponding to an increase of approximately 8.0%. The G3 alloy also shows markedly improved resistance to intergranular corrosion (maximum depth reduced by 45.1%) and achieves an exfoliation corrosion rating of EB. Quantitative strengthening analysis indicates that solid solution, grain boundary, and dislocation strengthening contribute approximately 11.57, 6.24, and 8.87 MPa to the yield strength, respectively.