Effect of cryogenic rolling on the microstructural evolution and mechanical properties of pure copper sheet

被引:28
|
作者
Li, X. B. [1 ,2 ,3 ]
Jiang, G. M. [1 ]
Di, J. P. [1 ]
Yang, Y. [1 ,4 ]
Wang, C. L. [5 ]
机构
[1] Jiangsu Univ Sci & Technol Zhangiiagang, Sch Met & Mat Engn, Suzhou 215600, Jiangsu, Peoples R China
[2] Jiangsu Sha Steel Grp Co Ltd, Inst Res Iron & Steel, Suzhou 215625, Jiangsu, Peoples R China
[3] Cent Iron & Steel Res Inst, Div Engn Steel, Beijing 100081, Peoples R China
[4] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[5] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 772卷
关键词
Cryogenic rolling; Dislocations; Recrystallization; Mechanical properties; Twins; DYNAMIC PLASTIC-DEFORMATION; TEXTURE EVOLUTION; GRAIN-REFINEMENT; CU; STRENGTH; TEMPERATURE; DUCTILITY; ALLOY;
D O I
10.1016/j.msea.2019.138811
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The pure copper sheets were rolled with a small strain in one pass at cryogenic and room temperature, respectively. The total thickness was reduced by 55% through three rolling passes. The microstructural evolution and mechanical properties of Cu sheets were investigated by metallographic characterizations, tensile tests and fracture analysis. It is found that several nanoscale mechanical twins are generated in the cryogenically rolled Cu sample. The restricted atomic motion at ultralow temperature inhibits the dislocation slip and then induces the occurrence of grain kinking and mechanical twining. The yield strength and ultimate tensile strength of cryorolled Cu sample are enhanced by the remarkable accumulation of dislocations and mechanical twins. During annealing treatment, the recrystallization behavior is accelerated by the dramatic strain energy and microstructural defects in cryogenically rolled Cu samples. Compared with the recrystallization concentrated on the surface of room temperature rolled Cu sample, a few of recrystallized grains are formed in the central position of cryogenically rolled Cu sample at 180 degrees C annealing. The rapid progress of thermal recovery during annealing treatment improves the tensile ductility and strain-hardening capacity of cryo-rolled Cu sample. Several pores are formed on the tensile fracture due to the incompatible deformation between the inhomogeneous grains. The results demonstrate that combining the cryogenic rolling and 200 degrees C annealing is able to improve the mechanical properties of pure copper sheet.
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页数:10
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