Scholarlink

<p>In high-strength 6XXX-series aluminum alloys, Cu additions readily increase susceptibility to intergranular corrosion. Here, by introducing trace amounts of Sn, the Cu-induced intergranular corrosion is mitigated while maintaining high intensity. When the Sn content is maintained below 0.05 wt%, improved corrosion resistance is achieved, primarily due to the narrowing of the precipitation-free zone. However, excessive Sn additions (&gt;0.05 wt%) increase the intergranular corrosion susceptibility of the alloys because of the formation of cathodic second phases such as Mg<sub>2</sub>(Si,Sn) phases. Under high Cu conditions, Cu atoms exhibit a higher tendency than Sn atoms to replace Al sites in the β" phases, thereby promoting strengthening of alloys. Meanwhile, Sn additions accelerate the age-hardening process, advancing the peak hardness by approximately 1 h. The mechanical properties exhibit a non-monotonic dependence on Sn level. Among them, the alloy containing 0.025 wt% Sn achieves the optimal property combination, with a yield strength approaching 400 MPa, a tensile strength of ~445 MPa, and a maximum intergranular corrosion depth of only ~110 μm.</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

Trace Sn effects on mechanical properties and intergranular corrosion resistance in high-strength Al-Mg-Si-Cu alloy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月27日

查看全文
  • Zhixin Feng,
  • Zibin Wu,
  • Hiromi Nagaumi,
  • Yifeng Li,
  • Dongtao Wang,
  • Rui Wang,
  • Cheng Guo,
  • Haitao Zhang,
  • Zhifu Mao,
  • Bo Zhang

摘要

In high-strength 6XXX-series aluminum alloys, Cu additions readily increase susceptibility to intergranular corrosion. Here, by introducing trace amounts of Sn, the Cu-induced intergranular corrosion is mitigated while maintaining high intensity. When the Sn content is maintained below 0.05 wt%, improved corrosion resistance is achieved, primarily due to the narrowing of the precipitation-free zone. However, excessive Sn additions (>0.05 wt%) increase the intergranular corrosion susceptibility of the alloys because of the formation of cathodic second phases such as Mg2(Si,Sn) phases. Under high Cu conditions, Cu atoms exhibit a higher tendency than Sn atoms to replace Al sites in the β" phases, thereby promoting strengthening of alloys. Meanwhile, Sn additions accelerate the age-hardening process, advancing the peak hardness by approximately 1 h. The mechanical properties exhibit a non-monotonic dependence on Sn level. Among them, the alloy containing 0.025 wt% Sn achieves the optimal property combination, with a yield strength approaching 400 MPa, a tensile strength of ~445 MPa, and a maximum intergranular corrosion depth of only ~110 μm.