Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys
Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys
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搅拌摩擦焊异种 2024-to-7075 铝合金的剥落腐蚀
DOI：
10.1016/j.matchar.2018.11.002
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发表时间：
2019-01-01
影响因子：
4.7
通讯作者：
Chen, D. L.
中科院分区：
文献类型：
--
作者：
Niu, P. L.;Li, W. Y.;Chen, D. L.
本研究的目的是确定基体金属（BM）位置对搅拌摩擦焊接异种2024-T351到7075-T651铝合金接头在EXCO溶液中的腐蚀行为的影响。利用电子背散射衍射（EBSD）、透射电镜（TEM）和高分辨电镜（HRTEM）等分析手段，对BMs和搅拌区（SZ）的微观结构进行了表征。采用扫描电子显微镜（SEM）观察这些腐蚀区的外观。结果表明，不锈钢带的耐蚀性与位于后退侧（RS）的BM相似，以晶间腐蚀（IGC）为主。SZ中细小的再结晶晶粒表现出比BM更剧烈的IGC。2024不锈钢中不连续分布的晶界析出相和无析出相区减轻了不锈钢的IGC损伤。
The objective of this study was to identify the effect of base metal (BM) locations on the corrosion behavior of friction stir welded dissimilar 2024-T351 to 7075-T651 aluminum alloys joints in an EXCO solution. Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were conducted to characterize the microstructure evolution of the BMs and stir zones (SZs). Scanning electron microscopy (SEM) was employed to observe the appearance of these corroded zones. Results reveal that the corrosion resistance of SZs is similar to that of the BM positioning in the retreating side (RS), and intergranular corrosion (IGC) is prevailing. The fine recrystallized grains in SZs exhibit more drastic IGC than that of BMs. The discontinuously distributed grain boundary precipitates and precipitate-free zones in the SZ of 2024 reduce the IGC damage of SZ.