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<p>In this study, Al-7Zn-2.5&#xa0;Mg-2Cu-0.1Zr-0.2Sc alloys with different aging states were selected as experimental objects to carry out slow strain rate tensile stress corrosion experiments, and characterized and analyzed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that when the aging time of the alloy is 10&#xa0;h, 22&#xa0;h and 34&#xa0;h, respectively, the intragranular precipitates appear as GP zone, η’ phase, η’ phase + η phase in turn. At the same time, the grain boundary precipitates gradually grow with the extension of aging time, and there is no precipitation zone at the grain boundary when aging for 22&#xa0;h and 34&#xa0;h. When the tensile test was carried out at a slow strain rate of 1 × 10<sup>-6</sup>&#xa0;s<sup>-1</sup> in 3.5 wt. % NaCl solution, the alloy treated by solution + aging for 22&#xa0;h showed the highest stress corrosion cracking (SCC) sensitivity. The fracture surface was mainly composed of cleavage facets and a small amount of small dimples. The SCC sensitivity of the alloy after aging for 10&#xa0;h is second, and 34&#xa0;h is third. The fracture surface is composed of a large number of dimples and small cleavage planes, showing ductile fracture characteristics.</p>

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Influence of Aging State by Microstructure and Stress Corrosion Behavior with Al-7Zn-2.5Mg-2.0Cu-0.1Zr-0.2Sc Alloy

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Xueyu Jiang,
  • Shuying Yin,
  • Xin Che,
  • Jiafeng Liu,
  • Yang Han

摘要

In this study, Al-7Zn-2.5 Mg-2Cu-0.1Zr-0.2Sc alloys with different aging states were selected as experimental objects to carry out slow strain rate tensile stress corrosion experiments, and characterized and analyzed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that when the aging time of the alloy is 10 h, 22 h and 34 h, respectively, the intragranular precipitates appear as GP zone, η’ phase, η’ phase + η phase in turn. At the same time, the grain boundary precipitates gradually grow with the extension of aging time, and there is no precipitation zone at the grain boundary when aging for 22 h and 34 h. When the tensile test was carried out at a slow strain rate of 1 × 10-6 s-1 in 3.5 wt. % NaCl solution, the alloy treated by solution + aging for 22 h showed the highest stress corrosion cracking (SCC) sensitivity. The fracture surface was mainly composed of cleavage facets and a small amount of small dimples. The SCC sensitivity of the alloy after aging for 10 h is second, and 34 h is third. The fracture surface is composed of a large number of dimples and small cleavage planes, showing ductile fracture characteristics.