采用光学显微镜和扫描电镜等研究新型含钪2124铝合金两种不同取向试样在3.5%NaCl(质量分数)溶液中的应力腐蚀开裂行为，并对裂纹尖端形貌和腐蚀形貌进行分析。结果表明：该铝合金在应力腐蚀时首先发生阳极溶解，裂纹尖端晶界处大量聚集的腐蚀产物产生的楔入力和外加应力的共同作用促使预制裂纹在腐蚀介质中进一步沿晶界向纵深方向扩展；两种取向试样在全浸腐蚀时均发生明显的晶间腐蚀，容易发生应力腐蚀开裂；得到了不同取向试样的应力腐蚀裂纹扩展规律及应力腐蚀强度因子门槛值，并探讨取向对应力腐蚀开裂行为的影响。
The stress corrosion cracking behavior of the novel 2124 aluminum alloy containing Sc with different sampling orientations in 3.5%NaCl (mass fraction) solution was studied by optical microscopy and scanning electron microscopy. Furthermore, the morphologies at the crack tip before and after corrosion were analyzed. The results show that the anodic dissolution occurs first during the stress corrosion, and the cooperation of the wedging action incured by the mass of corrosion products gathering at the grain boundaries and the applied stress drives the pre-cracks extending along the grain boundaries to the depth direction further in the corrosive medium. Obvious intergranular corrosion of the samples of the two orientations occurs under the total immersion corrosion and stress corrosion cracking takes places easily. The stress corrosion crack propagation law and the stress corrosion intensity factor threshold of the samples of different orientations are obtained. The effect of the sampling orientation on the stress corrosion cracking behavior was investigated.
参考文献
| [1] | 李成侣,潘清林,刘晓艳,何运斌,李文斌.2124铝合金的均匀化热处理[J].中国有色金属学报,2010(02):209-216. |
| [2] | 湛利华,李炎光,黄明辉.应力作用下2124合金蠕变时效的组织与性能[J].中南大学学报（自然科学版）,2012(03):926-931. |
| [3] | 郭加林,尹志民,沈凯,彭小芒,王华.使役条件下热暴露对2124-T851铝合金显微组织与性能的影响[J].中南大学学报（自然科学版）,2009(04):921-925. |
| [4] | 张欣.含钪铝合金及其应用[J].稀有金属,2007(06):857-861. |
| [5] | 王月,付自来,张燕阳.含钪铝合金焊接接头的耐腐蚀性能研究[J].材料开发与应用,2007(03):37-39,56. |
| [6] | B. Davo;A. Conde;J. de Damborenea .Stress corrosion cracking of B13, a new high strength aluminium lithium alloy[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2006(12):4113-4126. |
| [7] | 陶斌武,李松梅,刘建华.LY6铝合金的局部腐蚀行为研究[J].材料保护,2004(11):15-16,47. |
| [8] | SPEIDEL M O .Stress corrosion cracking of aluminum alloys[J].Metallurgical Transactions A,1975,4(06):631-651. |
| [9] | Santella ML;Engstrom T;Storjohann D;Pan TY .Effects of friction stir processing on mechanical properties of the cast aluminum alloys A319 and A356[J].Scripta materialia,2005(2):201-206. |
| [10] | JAYARAMAN M;BALASUBRAMANIAN V .Effect of process parameters on tensile strength of friction stir welded cast A356 aluminium alloy joints[J].Transactions of Nonferrous Metals Society of China,2013,23:605-615. |
| [11] | 肖代红,黄伯云,陈康华.Al-Cu-Mg-Ag-（Sc）合金的显微组织与腐蚀性能[J].中南大学学报（自然科学版）,2009(05):1252-1258. |
| [12] | 李文斌,潘清林,邹亮,梁文杰,何运斌,王昌臻.含Sc的超高强Al-Zn-Cu-Mg-Zr合金的晶间腐蚀和剥落腐蚀行为[J].航空材料学报,2008(01):53-58. |
| [13] | 王月.含钪铝合金的研究进展[J].上海金属,2003(01):36-40. |
| [14] | Xiaodong Liu;G.S. Frankel;B. Zoofan;S.I. Rokhlin .In-situ observation of intergranular stress corrosion cracking in AA2024-T3 under constant load conditions[J].Corrosion Science,2007(1):139-148. |
| [15] | DAVO B;CONDE A;de DAMBORENEA J .Inhibition of stress corrosion cracking of alloy AA8090 T-8171 by addition of rare earth salts[J].Corrosion Science,2005,47:1227-1237. |
| [16] | 陈险峰,彭大暑,张辉,林启权,林高用.热处理制度对2519铝合金板材力学性能和应力腐蚀敏感性的影响[J].中国有色金属学报,2003(04):934-938. |
| [17] | 刘建华,郝雪龙,李松梅,于美.新型含钪Al-Mg-Cu合金的抗应力腐蚀开裂特性[J].中国有色金属学报,2010(03):415-419. |
| [18] | 张新明,韩念梅,刘胜胆,宋丰轩,曾瑞林,黄乐瑜.7050铝合金厚板织构、拉伸性能及断裂韧性的不均匀性[J].中国有色金属学报,2010(02):202-208. |
| [19] | Hsueh-Lung Liao;Jing-Chie Lin;Sheng-Long Lee .Effect Of Pre-immersion On The Scc Of Heat-treated Aa7050 In An Alkaline 3.5%nacl[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2009(2):209-216. |
| [20] | D. McNaughtan;M. Worsfold;M.J. Robinson .Corrosion product force measurements in the study of exfoliation and stress corrosion cracking in high strength aluminium alloys[J].Corrosion Science,2003(10):2377-2389. |
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