Paper Title:
Continuous Recrystallization Phenomenon in High Purity Copper during Equal Channel Angular Pressing up to High Strain at Room Temperature
  Abstract

Equal channel angular pressing (ECAP) was conducted at room temperature to a high strain level of ~24 in high purity copper. Tensile testing, Transition Electron Microscopy (TEM) and Electron backscatter diffraction (EBSD) were used to characterize the microstructure and property evolution with the increase of ECAP strain. It was found that tensile yield strength and the stored energy increases upon ECAP processing until a peak reached at 8~12 passes of ECAP, and their saturation was observed at higher ECAP passes. Continuous recrystallization phenomenon in microstructure was observed, where dislocation free crystallites with large misorientation to their surrounding matrix and smaller than the nuclei for discontinuous recrystallization were observed embodied in the matrix of deformed structure with high dislocation density. A two-step process was observed for the formation of these small crystallites, first the condensing of dislocation tangles into a narrow boundary, mostly low angle boundary; And second local migration (in sub-micrometer range) of short grain boundaries, in strong contrast to the dramatic migration of long large angle grain boundaries during discontinuous recrystallization to swallow the deformed matrix, was observed leading to vanish of small subgrains.

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
929-937
DOI
10.4028/www.scientific.net/MSF.584-586.929
Citation
J. T. Wang, Y. Zhang, J. Q. Liu, "Continuous Recrystallization Phenomenon in High Purity Copper during Equal Channel Angular Pressing up to High Strain at Room Temperature", Materials Science Forum, Vols. 584-586, pp. 929-937, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Seng Ho Yu, Dong Hyuk Shin, Sun Keun Hwang
Abstract:To study the effect of grain size on texture and tensile properties of equal channel angular pressed commercially pure Ti, specimens were...
61
Authors: Dorothée Dorner, Yoshitaka Adachi, Kaneaki Tsuzaki
Abstract:Compression tests were performed on Fe-3%Si specimens with few grains. The deformation microstructure and microtexture were investigated by...
873
Authors: D.L. Engelberg, S. Rahimi, T.James Marrow
Abstract:The development of global microstructure characteristics has been compared to the local distribution and extent of Σ3 and Σ3n (1 n 3) grain...
3206
Authors: Xin Zhao, Xiao Ling Yang
Abstract:This paper analyzed the microstructure evolution and grain-refining mechanism in producing ultra-fine grained steel sheet by heavy rolling of...
1701
Authors: J.M. Rodriguez-Ibabe, P. Uranga, B. López
Keynotes
Abstract:The microstructural heterogeneities in steels may have different origins. The tendency in industry to decrease the total amount of reduction...
157