Scholarlink

<p>Laser powder bed fusion (LPBF) of AlMgScZr alloys has attracted significant interest due to its ability to meet lightweight requirements while delivering excellent performance. Applying an appropriate aging treatment regime is necessary for extending applications, as the established aging temperature significantly affects the final manufacturing quality. This work investigates the microstructure evolution and mechanical properties in both LPBF-fabricated and aging-treated samples. Accordingly, the effect of precipitated phase and recrystallization on the grain characteristics and performance is also discussed. The results demonstrate that Al<sub>3</sub>(Sc,Zr) particles precipitate from the supersaturated <i>α</i>-Al matrix during aging treatment at a temperature of 325&#xa0;℃ for 4&#xa0;h. The formation of Al<sub>3</sub>(Sc,Zr) particles, which act as heterogeneous nucleation sites, induces grain refinement and exerts a pinning effect on the dislocation motion. Consequently, the tensile strength is significantly enhanced, while the elongation is reduced. When subjected to aging at 475&#xa0;℃ for 4&#xa0;h, precipitated phase coarsening and recrystallization occur both inside the columnar grains and equiaxed grains. The resultant mechanical properties are synergistically influenced by multiple influencing mechanisms, including solid solution strengthening, subgrain and precipitation strengthening. The maximum tensile strength and impact energy could be obtained to 490 ± 10 MPa and 24.67 ± 1.83&#xa0;J. This study establishes a framework for optimizing aging treatments and advancing the theoretical understanding of LPBF-fabricated AlMgScZr alloys.</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

The Influence of Aging Treatment on the Microstructure Characteristics and Mechanical Properties of AlMgScZr Alloy Prepared by LPBF

  • 期刊论文

  • 发表日期：

    2025年12月5日

查看全文
  • Jieren Guan,
  • Yunhua Liu,
  • Zengwei Zhu,
  • Qiuping Wang

摘要

Laser powder bed fusion (LPBF) of AlMgScZr alloys has attracted significant interest due to its ability to meet lightweight requirements while delivering excellent performance. Applying an appropriate aging treatment regime is necessary for extending applications, as the established aging temperature significantly affects the final manufacturing quality. This work investigates the microstructure evolution and mechanical properties in both LPBF-fabricated and aging-treated samples. Accordingly, the effect of precipitated phase and recrystallization on the grain characteristics and performance is also discussed. The results demonstrate that Al3(Sc,Zr) particles precipitate from the supersaturated α-Al matrix during aging treatment at a temperature of 325 ℃ for 4 h. The formation of Al3(Sc,Zr) particles, which act as heterogeneous nucleation sites, induces grain refinement and exerts a pinning effect on the dislocation motion. Consequently, the tensile strength is significantly enhanced, while the elongation is reduced. When subjected to aging at 475 ℃ for 4 h, precipitated phase coarsening and recrystallization occur both inside the columnar grains and equiaxed grains. The resultant mechanical properties are synergistically influenced by multiple influencing mechanisms, including solid solution strengthening, subgrain and precipitation strengthening. The maximum tensile strength and impact energy could be obtained to 490 ± 10 MPa and 24.67 ± 1.83 J. This study establishes a framework for optimizing aging treatments and advancing the theoretical understanding of LPBF-fabricated AlMgScZr alloys.

Graphical abstract