Scholarlink

<p>This study demonstrates a solution-free T5 aging pathway to achieve mechanical parity with conventional T6 treatment in a novel Al-4.6&#xa0;Mg-4.6Zn-0.1Mn crossover alloy, overcoming the energy-intensive limitations of solution treatment. Systematic investigations reveal that direct aging of extruded-water-quenched material at 140℃/23&#xa0;h delivers competitive properties (ultimate tensile strength (UTS) 528.5&#xa0;MPa, yield strength (YS) 469.0&#xa0;MPa, elongation (EL) 8%) versus T6 processing (UTS 519.2&#xa0;MPa, YS 467.7&#xa0;MPa, EL 9%). Crucially, dislocation-assisted precipitation is identified as the enabling mechanism. Nanoscale T-Mg<sub>32</sub>(Al,Zn)<sub>49</sub> precipitates (5.2–6.5&#xa0;nm) nucleate preferentially on dislocations in as-extruded material, reducing activation energy versus T6. Moreover, a graded PFZ-η-T grain boundary structure in T6 specimens compensates for the theoretical 27.9&#xa0;MPa strength deficit from reduced dislocation and grain boundary hardening. Superior ductility (8% EL) in finer-grained T5 alloy (6.35&#xa0;µm vs. 23.49&#xa0;µm) arises from exceptional microstructural homogeneity and crack-branching at discontinuous grain boundary precipitates. This work establishes dislocation-mediated precipitation as a microstructure design lever to bypass solution treatment, enabling energy-efficient manufacturing of high mechanical properties Al–Mg-Zn alloys. The strategy unlocks precise property control in large-scale complex components of aluminum alloy, significantly broadening the industrial applications.</p> Graphical Abstract <p></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

Achieving T6-Strength Via Dislocation-Assisted Precipitation: Solution-Free Aging of an Al-4.6 Mg-4.6Zn-0.1Mn Crossover Alloy

  • 期刊论文

  • 发表日期：

    2025年12月17日

查看全文
  • Hengpan Yuan,
  • Xianwei Ren,
  • Yong Xue,
  • Zhimin Zhang,
  • Tao Ma,
  • Ya Cui

摘要

This study demonstrates a solution-free T5 aging pathway to achieve mechanical parity with conventional T6 treatment in a novel Al-4.6 Mg-4.6Zn-0.1Mn crossover alloy, overcoming the energy-intensive limitations of solution treatment. Systematic investigations reveal that direct aging of extruded-water-quenched material at 140℃/23 h delivers competitive properties (ultimate tensile strength (UTS) 528.5 MPa, yield strength (YS) 469.0 MPa, elongation (EL) 8%) versus T6 processing (UTS 519.2 MPa, YS 467.7 MPa, EL 9%). Crucially, dislocation-assisted precipitation is identified as the enabling mechanism. Nanoscale T-Mg32(Al,Zn)49 precipitates (5.2–6.5 nm) nucleate preferentially on dislocations in as-extruded material, reducing activation energy versus T6. Moreover, a graded PFZ-η-T grain boundary structure in T6 specimens compensates for the theoretical 27.9 MPa strength deficit from reduced dislocation and grain boundary hardening. Superior ductility (8% EL) in finer-grained T5 alloy (6.35 µm vs. 23.49 µm) arises from exceptional microstructural homogeneity and crack-branching at discontinuous grain boundary precipitates. This work establishes dislocation-mediated precipitation as a microstructure design lever to bypass solution treatment, enabling energy-efficient manufacturing of high mechanical properties Al–Mg-Zn alloys. The strategy unlocks precise property control in large-scale complex components of aluminum alloy, significantly broadening the industrial applications.

Graphical Abstract