Grain refinement in hot working of 2219 aluminium alloy: On the effect of deformation mode and loading path

被引：21
作者：
Zeng, X. [1 ,2 ]
Fan, X. G. [1 ,2 ]
Li, H. W. [1 ,2 ]
Zhan, M. [1 ,2 ]
Li, S. H. [3 ,4 ]
Ren, T. W. [1 ,2 ]
Wu, K. Q. [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming T, Xian 710072, 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
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 794卷
基金：
中国国家自然科学基金;
关键词：
2219 aluminium alloy; Deformation mode; Loading path; Microstructure evolution; Grain refinement mechanism; SEVERE PLASTIC-DEFORMATION; PLANE-STRAIN COMPRESSION; MICRO-TEXTURE EVOLUTION; MECHANICAL-PROPERTIES; DYNAMIC RECRYSTALLIZATION; ONE-PASS; MICROSTRUCTURE; BEHAVIOR; ECAP; ALUMINUM-ALLOY-2219;
D O I：
10.1016/j.msea.2020.139905
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
To study the effect of deformation mode together with loading path on the microstructure evolution of 2219 aluminium alloy at elevated temperature, plane strain compression (PSC) and uniaxial compression (UC) along different loading paths (rolling direction (RD), transverse direction (TD) and normal direction (ND)) as well as equal-channel angular pressing (ECAP) along RD were performed on the cubic and cylindrical samples cut from thick plate. Detailed microstructure evolution was characterized by optical microscope and electron backscattered diffraction (EBSD). The results indicate that the PSC deformation shows a higher stress level than UC and an increasing discrepancy in flow softening occurs with the increasing strain during PSC along different loading paths. The volume fraction of dynamic recrystallization (DRX) after RD-UC is higher than that of RD-PSC, while the grain refinement level is the lowest in the one pass ECAP. DRX is the main grain refinement mechanism for RD-UC, while deformation bands (DBs) are dominant in RD-PSC and ECAP. Due to the grain morphology anisotropy, a significant microstructural difference was exhibited in the PSCed samples along different loading paths. The grain refinement in hot working of 2219 aluminium alloy plate is greatly related to the deformation modes and loading paths in view of the brick-like grains.
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页数：14
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