Optimized Combinatorial Properties of an AlMgSi(Cu) Alloy Achieved by a Mechanical-Thermal Combinatorial Process

doi:10.1007/s40195-018-0818-1

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (5): 751-758.DOI: 10.1007/s40195-018-0818-1

• • 上一篇

收稿日期:2018-05-23 修回日期:2018-07-23 出版日期:2020-05-10 发布日期:2020-05-25

Optimized Combinatorial Properties of an AlMgSi(Cu) Alloy Achieved by a Mechanical-Thermal Combinatorial Process

Li-Mei Liu¹, Yu-Xiang Lai¹, Chun-Hui Liu¹, Jiang-Hua Chen¹^,²()

¹Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan University, Changsha 410082, China
²Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha 410082, China

Received:2018-05-23 Revised:2018-07-23 Online:2020-05-10 Published:2020-05-25
Contact: Jiang-Hua Chen

摘要/Abstract

Abstract:

Enhancing combinatorial properties, such as excellent corrosion resistance, high strength and good ductility combined, is an important issue for manufacturing high-quality AlMgSi(Cu) alloys. Here, we show that this can be achieved by optimizing a combinatorial process consisting of pre-ageing, cold-rolling and post-ageing to tailor the hierarchical microstructures of the alloy. Transmission electron microscopy analysis reveals that the enhanced combinatorial properties of corrosion resistance, strength and ductility are owing to modification of grain boundary microstructure in good association with changes of precipitate microstructures and a more homogenous distribution of solute atoms, as compared with the microstructures of the alloy processed by thermal ageing only.

Key words: Al alloy, Corrosion resistance, Mechanical property, Ageing, Deformation

. [J]. 金属学报英文版, 2020, 33(5): 751-758.

Li-Mei Liu, Yu-Xiang Lai, Chun-Hui Liu, Jiang-Hua Chen. Optimized Combinatorial Properties of an AlMgSi(Cu) Alloy Achieved by a Mechanical-Thermal Combinatorial Process[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(5): 751-758.

图/表 6

Fig. 1 SEM cross-sectional micrographs of the alloys T6 aged for a 30 min, b 24 h, c 120 h. The observation plane is shown by the inset sketch

Fig. 2 DA alloys post-aged at 180 °C for a 10 min, b 30 min, c 48 h; at 150 °C for d 30 min, e 8 h, f 144 h; at 120 °C for g 1 h, h 60 h, i 120 h after immersion test. The observation plane is shown by the inset sketch

Fig. 3 a Combination of maximum corrosion depths and yield strength, b combination of uniform ductility and yield strength in samples treated with various conditions. All of the DA samples are peak-aged at different post-ageing temperatures as indicated in the images. The T78 results of the alloy were obtained in Ref. [22]

Fig. 4 TEM images of the T6 peak-aged samples: a matrix precipitates, b typical grain boundary feature

Fig. 5 TEM images of the DA samples post-aged a-d at 120 °C for 120 h, e at 150 °C for 8 h, f at 180 °C for 30 min recorded in a the side plane (side-view, the plane perpendicular to the transverse direction) and b-f the rolling plane (plane-view). The white arrows in c, e, f indicate the nano-sized precipitates

Fig. 6 HAADF-STEM images and the corresponding EDS mappings of the samples treated with different conditions: a T6 sample aged at 180 °C for 24 h, b DA samples aged at 180 °C for 30 min, c at 150 °C for 8 h, d at 120 °C for 120 h

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Optimized Combinatorial Properties of an AlMgSi(Cu) Alloy Achieved by a Mechanical-Thermal Combinatorial Process

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