蠕变时效对Al-0.62Mg-0.55Si合金耐晶间腐蚀性能的影响
Effects of Creep Aging on Intergranular Corrosion Resistance of Al-0.62Mg-0.55Si Alloy
DOI: 10.12677/ms.2026.165120, PDF,   
作者: 杜方超：湖南汽车工程职业大学公共课教学部，湖南 株洲；王 宇*：湖南汽车工程职业大学航空工程学院，湖南 株洲；新能源车辆节能设计与绿色制造湖南省工程研究中心，湖南 株洲
关键词: Al-Mg-Si合金；蠕变时效；晶间腐蚀；晶界析出相；晶界无沉淀析出带；Al-Mg-Si Alloys； Creep Aging； Intergranular Corrosion； Grain Boundary Precipitates； Precipitate-Free Zone (PFZ)
摘要: 本文采用晶间腐蚀浸泡实验、透射电子显微镜(TEM)等方法，研究了蠕变时效工艺参数(单轴拉应力和蠕变时效时间)对Al-0.62Mg-0.55Si合金晶间腐蚀性能的影响。试验结果表明，实验用峰值时效态Al-Mg-Si合金的晶间腐蚀敏感性随外加应力增大而减小，外加应力为75 MPa时，试样晶间腐蚀深度最小；在相同外加应力条件下，轻微过时效的试样(75 MPa/12h)表现最优的耐晶间腐蚀性能，且能较好地协调强度与耐蚀性。透射电镜显微组织分析结果表明，一方面，外加应力的引入，促进了析出相的析出，同时降低了PFZ宽度，从而降低了晶界析出相与PFZ形成腐蚀微电偶的几率；另一方面，晶界析出相呈断续分布，切断了腐蚀扩展通道，使轻微过时效的75 MPa/12h试样获得较好的耐晶间腐蚀性能。
Abstract: The effects of creep aging process parameters (uniaxial tensile stress and creep aging time) on the intergranular corrosion (IGC) resistance of Al-0.62Mg-0.55Si alloy were investigated in this paper by means of IGC immersion test and transmission electron microscopy (TEM). The test results showed that the IGC susceptibility of the peak-aged experimental Al-Mg-Si alloy decreased with increasing of applied stress; the minimum IGC depth is observed in the specimen under an applied stress of 75 MPa. Under the same applied stress condition, the slightly overaged specimen (75 MPa/12h) exhibits the best IGC resistance and achieves a favorable balance between strength and corrosion resistance. TEM microstructure analysis revealed that, on the one hand, the applied stress promotes precipitation while reducing the width of the precipitate-free zone (PFZ), thereby decreasing the probability of forming corrosion micro-galvanic couples between grain boundary precipitates and the PFZ. On the other hand, the grain boundary precipitates are discontinuously distributed, which interrupts the corrosion propagation path, enabling the slightly overaged 75 MPa/12h specimen to obtain good IGC resistance.
文章引用：杜方超, 王宇. 蠕变时效对Al-0.62Mg-0.55Si合金耐晶间腐蚀性能的影响[J]. 材料科学, 2026, 16(5): 266-274. https://doi.org/10.12677/ms.2026.165120

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