Grain morphology related microstructural developments in bulk deformation of 2219 aluminum alloy sheet at elevated temperature

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:760

Article

Zeng, X.^1,2  Fan, X. G.^1,2  Li, H. W.^1,2  Zhan, M.^1,2  Li, S. H.^3,4 

[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

[2] Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming T, Xian 710072, Shaanxi, Peoples R China

[3] Shanghai Jiao Tong Univ, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China

[4] Shanghai Jiao Tong Univ, Shanghai Key Lab Digital Manufacture Thin Walled, Shanghai 200240, Peoples R China

关键词: 2219 aluminum alloy;    Deformation behavior;    Microstructure evolution;    Bulk deforming;    Grain morphology;   

DOI  :  10.1016/j.msea.2019.06.022

来源: Elsevier

【 摘 要 】

This work focuses on the plastic deformation behavior and microstructure evolution in high temperature sheet bulk forming of 2219 aluminum alloy. Uniaxial compression tests were carried out along the normal direction (ND), transverse direction (TD) and rolling direction (RD) of an annealed rolled sheet which has brick-like grains but weak texture. Electron backscattered diffraction (EBSD) was employed to observe the microstructure after compression deformation. Experimental results show strong anisotropy in plastic flow in spite of non-prominent anisotropy in strength. Meanwhile, grain refinement mechanisms transform from geometric dynamic re crystallization (GDRX) in ND compression to discontinuous dynamic recrystallization (DDRX) with enhanced particle stimulated nucleation (PSN) effect in TD and RD compressions. Grain morphology has little effect on the plastic anisotropy. However, the heterogeneous deformation associated with the distortion of brick-like grains in compression accounts for the diverse microstructural developments to a large extent.

【 授权许可】

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