| 不同晶粒尺寸5083铝合金晶间腐蚀和应力腐蚀开裂的差异性 |
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| 引用本文： | 秦晋,李志,马明阳,易丹青,王斌.不同晶粒尺寸5083铝合金晶间腐蚀和应力腐蚀开裂的差异性[J].中国有色金属学会会刊,2022,32(3):765-777. |
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| 作者姓名： | 秦晋 李志 马明阳 易丹青 王斌 |
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| 摘 要： | 通过冷轧和退火获得具有不同晶粒尺寸(8.7～79.2μm)的5083铝合金板.研究其微观结构、晶间腐蚀(IGC)、应力腐蚀开裂(SCC)和裂纹扩展行为.结果表明,粗晶粒样品表现出更好的抗IGC性能,其腐蚀深度为15μm.慢应变速率测试结果表明,细晶粒样品表现出更好的抗SCC性能,敏感性指数ISSRT为11.2％.此外,...
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| 关 键 词： | 晶粒尺寸 晶间腐蚀 应力腐蚀开裂 裂纹扩展 5083铝合金 |
| 收稿时间： | 15 April 2021 |
Diversity of intergranular corrosion and stress corrosion cracking for 5083 Al alloy with different grain sizes |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China;3. The Second Research Institute of Civil Aviation Administration of China, Chengdu 610064, China |
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| Abstract: | 5083 Al alloy sheets with different grain sizes (8.7?79.2 μm) were obtained by cold rolling and annealing. Their microstructures, intergranular corrosion (IGC), stress corrosion cracking (SCC), and crack propagation behaviors were investigated. The results showed that samples with coarse grains exhibit better IGC resistance with a corrosion depth of 15 μm. The slow strain rate test results revealed that fine-grained samples exhibit better SCC resistance with a susceptibility index (ISSRT) of 11.2%. Furthermore, based on the crack propagation mechanism, grain refinement can improve the SCC resistance by increasing the number of grain boundaries to induce the corrosion crack propagation along a tortuous path. The grains with {011} orientation could hinder crack propagation by orientating it toward the low-angle grain boundary region. The crack in the fine-grained material slowly propagates due to the tortuous path, and low H+ and Cl? concentrations. |
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| Keywords: | grain size intergranular corrosion stress corrosion cracking crack propagation 5083 Al alloy |
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