Grain boundary precipitation induced by grain crystallographic misorientations in an extruded Al-Mg-Si-Cu alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:624

Article

Yang, Wenchao^1,2  Ji, Shouxun²  Li, Zhou¹  Wang, Mingpu¹ 

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[2] Brunel Univ London, Brunel Ctr Adv Solidificat Technol, Uxbridge UB8 3PH, Middx, England

关键词: Aluminium alloys;    Grain boundary;    Transmission electron microscope;    EBSD;   

DOI  :  10.1016/j.jallcom.2014.10.206

来源: Elsevier

【 摘 要 】

The grain boundary precipitation induced by grain crystallographic misorientations in an extruded Al-Mg-Si-Cu alloy was investigated by electron back-scattering patterns and high resolution transmission electron microscopy. The results showed that compared with the recrystallization cube {100}[001] texture, the deformation brass {110}[112] texture prevailed in the microstructure. The brass texture mainly contributed for the formation of low angle grain boundaries, where the pre-beta ''/beta' phases were formed during precipitation. The recrystallization cube texture predominately induced the formation of high angle grain boundaries, where the Q'/Q phases related to the corrosion were precipitated. And, high and low grain boundary was 23.5% and 76.5% proportion in the microstructure, respectively. Finally, it was believed that in order to improve the resistance to intergranular corrosion of alloy, the recrystallization cube {100}[001] texture should be inhibited as far as possible. (C) 2014 Elsevier B.V. All rights reserved.

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