Scholarlink

<p>The effects of copper on the mechanical and corrosion properties of the Al-7.6Zn-2.2Mg (wt.%) alloy were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile testing and corrosion testing. The results indicate that with the addition of Cu ranging from 0.2 to 2.5 wt.%, the alloy’s strength after single-stage peak aging (T6) increases from 585.1 to 657.3&#xa0;MPa due to the transition of the precipitate strengthening phase. Additionally, the stress corrosion resistance improves progressively, whereas the intergranular corrosion resistance deteriorates gradually. The variations in alloy properties are explained by considering the variety and number of strengthening phases in the different alloys. In alloys with low Cu content, the T phase is the primary precipitate, and as Cu content increases, the T phase gradually transforms into the S and θ phases. The S phase serves as a nucleating particle that promotes the precipitation and refinement of the η phase in the crystal, thereby enhancing the alloy’s strength. Copper enters the precipitation phase of the matrix and the precipitated phase at the grain boundaries, increasing the potential difference between the grain boundaries and the matrix, which diminishes the alloy’s intergranular corrosion resistance. Adding Cu to the alloy leads to the formation of large grain boundary precipitates, which can trap hydrogen atoms at the grain boundaries, reduce the occurrence of hydrogen embrittlement, and improve the alloy’s stress corrosion resistance.</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

Effect of Cu Content on Microstructure and Properties of 7xxx Series Alloy

  • 期刊论文

  • 发表日期：

    2025年5月8日

查看全文
  • Haitao Zhang,
  • Zheng Wang,
  • Donghui Yang,
  • Zibin Wu,
  • Hiromi Nagaumi,
  • Ke Qin,
  • Cheng Guo,
  • Chengbin Yu,
  • Ziping Li

摘要

The effects of copper on the mechanical and corrosion properties of the Al-7.6Zn-2.2Mg (wt.%) alloy were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile testing and corrosion testing. The results indicate that with the addition of Cu ranging from 0.2 to 2.5 wt.%, the alloy’s strength after single-stage peak aging (T6) increases from 585.1 to 657.3 MPa due to the transition of the precipitate strengthening phase. Additionally, the stress corrosion resistance improves progressively, whereas the intergranular corrosion resistance deteriorates gradually. The variations in alloy properties are explained by considering the variety and number of strengthening phases in the different alloys. In alloys with low Cu content, the T phase is the primary precipitate, and as Cu content increases, the T phase gradually transforms into the S and θ phases. The S phase serves as a nucleating particle that promotes the precipitation and refinement of the η phase in the crystal, thereby enhancing the alloy’s strength. Copper enters the precipitation phase of the matrix and the precipitated phase at the grain boundaries, increasing the potential difference between the grain boundaries and the matrix, which diminishes the alloy’s intergranular corrosion resistance. Adding Cu to the alloy leads to the formation of large grain boundary precipitates, which can trap hydrogen atoms at the grain boundaries, reduce the occurrence of hydrogen embrittlement, and improve the alloy’s stress corrosion resistance.