Mechanical properties and microstructure evolution of an Al-Cu-Li alloy subjected to rolling and aging

被引:20
作者
Wang Lin [1 ,2 ]
Laxman, Bhatta [1 ,2 ]
Xiong Han-qing [1 ,2 ]
Li Chang [1 ,2 ]
Cui Xiao-hui [1 ,2 ,3 ]
Charlie, Kong [4 ]
Yu Hai-liang [1 ,2 ,3 ]
机构
[1] Cent South Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Peoples R China
[2] Cent South Univ, Coll Mech & Elect Engn, Changsha 410083, Peoples R China
[3] Cent South Univ, Light Alloys Res Inst, Changsha 410083, Peoples R China
[4] Univ New South Wales, Electron Microscope Unit, Sydney, NSW 2052, Australia
基金
中国国家自然科学基金;
关键词
Al-Cu-Li alloy; cryorolling; artificial aging; dynamic precipitation; dislocation density; mechanical property; HIGH-PRESSURE TORSION; MG-SI ALLOY; ALUMINUM-ALLOY; TENSILE PROPERTIES; TEXTURE EVOLUTION; DEFORMATION; PRECIPITATION; STRENGTH; BEHAVIOR; IMPROVEMENT;
D O I
10.1007/s11771-021-4764-0
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The mechanical properties and microstructure of Al-Cu-Li alloy sheets subjected to cryorolling (-100 degrees C, -190 degrees C) or hot rolling (400 degrees C) and subsequent aging at 160 degrees C for different times were investigated. The dynamic precipitation and dislocation characterizations were examined via transmission electron microscopy and X-ray diffraction. The grain morphologies and the fracture-surface morphologies were studied via optical microscopy and scanning electron microscopy. Samples subjected to cryorolling followed by aging exhibited relatively high dislocation densities and a large number of precipitates compared with hot-rolled samples. The samples cryorolled at -190 degrees C and then aged for 15 h presented the highest ultimate tensile strength (586 MPa), while the alloy processed via hot rolling followed by 10 h aging exhibited the highest uniform elongation rate (11.5%). The size of precipitates increased with the aging time, which has significant effects on the interaction mechanism between dislocations and precipitates. Bowing is the main interaction method between the deformation-induced dislocations and coarsened precipitates during tensile tests, leading to the decline of the mechanical properties of the alloy during overaging. These interesting findings can provide significant insights into the development of materials possessing both excellent strength and high ductility.
引用
收藏
页码:3800 / 3817
页数:18
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