Intergranular corrosion of AA6082 Al-Mg-Si alloy extrusion: The influence of trace Cu and grain boundary misorientation

JOURNAL OF ALLOYS AND COMPOUNDS

卷:853

Article

Zhang, Xinxin^1,2  Lv, You¹  Hashimoto, Teruo²  Nilsson, Jan-Olov³  Zhou, Xiaorong² 

[1] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ,Hubei Key Lab Mat Chem & Serv Failure, 1037 Luoyu Rd, Wuhan 430074, Peoples R China

[2] Univ Manchester, Corros & Protect Ctr, Sch Mat, Manchester M13 9PL, Lancs, England

[3] Hydro Extruded Solut, S-61281 Finspang, Sweden

关键词: Aluminium;    Al2Cu;    Grain boundary precipitation;    Grain boundary misorientation;    Intergranular corrosion;   

DOI  :  10.1016/j.jallcom.2020.157228

来源: Elsevier

【 摘 要 】

In the present work, the influence of trace level Cu on intergranular corrosion (IGC) in AA6082 Al-Mg-Si alloy is studied using correlative accelerated corrosion testing and high resolution electron microscopy. Further, grain boundary structure and its correlation to IGC are also investigated using electron backscatter diffraction (EBSD) and transmission Kikuchi diffraction (TKD). It is found that in AA6082-T6 alloy with very low Cu content (0.06 wt%), about 13% of high angle grain boundaries have Al2Cu precipitates, which promotes IGC at the grain boundaries. (C) 2020 The Authors. Published by Elsevier B.V.

【 授权许可】

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