An investigation on rolling texture transition in copper preprocessed by equal channel angular pressing

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• 作者：Yao Jiang ; Rong Zhu ; Jing Tao Wang ; Ze Sheng You
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：51
• 期：12
• 页码：5609-5624
• 全文大小：2,758 KB
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• 作者单位：Yao Jiang (1)
  Rong Zhu (1)
  Jing Tao Wang (1)
  Ze Sheng You (2)
  
  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
  2. Herbert Gleiter Institute of Nano-science (HGI), Nanjing University of Science and Technology, Nanjing, 210094, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

The effects of equal channel angular pressing (ECAP) and subsequent rolling path on the evolutions of rolling texture and flow stress anisotropy in the finally cold-rolled copper sheet was investigated. Copper billets processed by 1, 2, 4, and 8 passes of ECAP were subjected to cold rolling via three different paths: unidirectional rolling along extrusion or transverse direction of ECAP, or cross rolling. The microstructure, texture, and flow stress were characterized by EBSD, TEM, XRD, and tensile testing, respectively. The rolling texture was found transformed from copper-type to brass-type as the initial prerolling microstructure was refined from coarse grained to ultrafine grained (UFG) by multipass ECAP; Cross rolling, which is conventionally considered effective in reducing texture strength and thus mechanical anisotropy in coarse-grained materials, has proven to be ineffective in UFG copper. The flow stress anisotropy in the rolled copper sheet was found mainly controlled by the microstructural-dependent anisotropy of critical resolved shear stress rather than texture strength, and this leads to decrease of flow stress anisotropy in the cold-rolled copper sheet upon the increase in the number of preprocessing ECAP passes.