Micro-structural Evolution in Metals Subjected to Simple Shear by a Particular Severe Plastic Deformation Method

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• 作者：Jinghui Li ; Fuguo Li ; Pan Li ; Zhanchao Ma…
• 关键词：finite element simulation ; grain refinement ; micro ; structural evolution ; pure copper ; severe plastic deformation
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：24
• 期：8
• 页码：2944-2956
• 全文大小：4,377 KB
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• 作者单位：Jinghui Li (1)
  Fuguo Li (1)
  Pan Li (1)
  Zhanchao Ma (1)
  Chengpeng Wang (1)
  Lei Wang (1)
  
  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi鈥檃n, 710072, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024

文摘

Simple shear (SS) has been considered an optimal deformation method of severe plastic deformation (SPD). To achieve SS, a particular SPD method known as mutative channel torsion extrusion (MCTE) was designed based on the geometric equivalence of SS, and the cavity parameters of a die were calculated according to strain equivalence. To investigate the characteristics of micro-structural evolution subjected to MCTE, simulated and experimental investigations were conducted. The simulated results indicate that equivalent strain distribution on the cross section is relatively uniform, and the metallographic observations confirm the simulated phenomenon. Transmission electron microscopy investigations show that the process of grain refinement undergoes the formation of shear bands, dislocation cells, dislocation forests, large-angle grain boundaries, and recrystallization nuclei. Two types of mechanisms are proposed in view of the different effects of SS on grain refinement. Eventually, MCTE is ensured as an effective method for grain refinement.