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Intergranular corrosion of spark plasma sintered 2024 aluminum alloy at different heat treatment states

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Abstract

2024 aluminum alloys were consolidated by using spark plasma sintering (SPS) method, and then heat treated by solid solution treatment (SST) and aging treatment (AT) procedures. The average grain size of bulk samples sintered with 5, 20 and 50 μm powders was 3.72, 4.73 and 8.11 μm, respectively. The difference between the average grain size and original powder size was attributed to the recrystallization during short sintering process. The number of the inclusion phases in these samples decreased after SST and increased after subsequent AT. Besides, it was observed that intergranular corrosion (IGC) cracks initiated from stable pits due to the electrochemical inhomogeneity between the intermetallic particles (IMPs) and the aluminum matrix (176.02, 110.83 and 164.80 mV for as-SPS, as-SST and as-AT samples, respectively). Besides, the cracks would propagate along the grain boundaries (GBs) and bypass the IMPs at GBs during propagation. It was revealed that the sample after SST presented the best IGC resistance, and this was ascribed to the reduce of IMPs, both in size and number.

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摘要

本文采用放电等离子烧结法制备了2024铝合金, 并对铝合金进行固溶和时效热处理, 研究了2024铝合金的晶间腐蚀行为随热处理过程的演变规律。结果表明, 烧结的 2024铝合金的晶间腐蚀敏感性在固溶处理后提升, 而在时效处理后降低。分析表明这是由于固溶处理后的试样中的析出相的数量减少, 尺寸降低。铝合金表面的晶间腐蚀裂纹起源于稳定的点蚀坑, 而点蚀萌生是由于析出相的存在, 析出相的数量减少使得点蚀萌生位点减少。同时, 研究发现裂纹沿晶界拓展, 固溶后试样的晶间腐蚀敏感性降低是由于析出相与铝基体间电势差降低 (烧结后, 固溶后和时效后的电势差分别为: 176.02, 110.83以及164.80 mV), 从而降低了裂纹拓展驱动力。

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Acknowledgements

This research was financially supported by the National Nature Science Foundations of China (Nos. 51271012 and 51671013).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Yan-Bing Meng, Song-Mei Li, Jian-Hua Liu & Mei Yu

  2. School of Materials Engineering, North China Institute of Aerospace Engineering, Langfang, 065000, China

    Wen-Ming Tian

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Meng, YB., Li, SM., Liu, JH. et al. Intergranular corrosion of spark plasma sintered 2024 aluminum alloy at different heat treatment states. Rare Met. 41, 3865–3877 (2022). https://doi.org/10.1007/s12598-022-01990-7

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