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首页> 外文期刊>Journal of Materials Engineering and Performance >Morphological Evolution of S-Phase in 2024 Aluminum under Tensile Creep at 448-463K
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Morphological Evolution of S-Phase in 2024 Aluminum under Tensile Creep at 448-463K

机译：448-463K在拉伸蠕变下2024铝中S相的形态演变

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摘要

The morphological evolution behavior of S-phase in 2024 aluminum alloy under uniaxial tensile creep test at 448 and 463K under 175, 200 and 225MPa was studied in detail by HRTEM. Results showed that the S-phase was arranged in the zigzag manner, similar to a zebra pattern, under tensile stress at 448-463K. And it maintained cubic structure, remarkably grew along the tension direction under uniaxial tensile stress, but grew minimally perpendicular to the stress direction. Compared with applied stress, the temperature had a greater effect on the growth of S-phase. The length of S-phase reached 100 +/- 20nm after testing for 24h at 448K under 200MPa and 200 +/- 50nm after testing for 18h at 463K under 175MPa. The S-phase not only grew significantly in length but also coarsened at 463K, the lamellar structure becoming fuzzy, which caused the alloy to enter the tertiary creep stage, unsuitable for creep-aging forming.
机译：通过HRTEM详细研究了在445,200和225MPa下的单轴拉伸蠕变试验下2024铝合金S相的形态演化行为。 结果表明，S相以曲折的方式排列，类似于斑马图案，在448-463K处的拉伸应力下。 并且它保持立方结构，在单轴拉伸应力下沿张力方向显着增长，但在最小地垂直于应力方向。 与施加应力相比，温度对S相的生长具有更大的影响。 在145MPa下463K的测试后，在200MPa和200 + / -50nm下测试24小时后，S相的长度达到了100 +/-20nm。 S阶段不仅在长度大大增长，而且在463K中粗糙，层状结构变得模糊，这使得合金进入三级蠕变阶段，不适合蠕变衰老成型。

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