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Title: Microstructure quantification and correlation with flow stress of ultrafine grained commercially pure Al fabricated by equal channel angular pressing (ECAP)

Abstract

Commercial purity Al was severely deformed by equal channel angular pressing (ECAP) up to eight passes using route B{sub C}. The deformation microstructure was characterized quantitatively by electron-backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The microstructural homogeneity was investigated by EBSD at various locations from center to surface of the samples on a longitudinal section parallel to the pressing direction. Structural parameters including mean boundary spacing, boundary misorientation angle and fraction of high angle grain boundaries were measured and characterized through the section of the ECAP samples. EBSD scans revealed a homogeneous ultrafine grained microstructure after 8 passes. The analysis showed that the fraction of high angle grain boundaries was more than 70% at most locations of the sample section. Also, an average boundary spacing of 380 nm was obtained by the linear intercept method. TEM analysis was used for more detailed characterization of the microstructure, such as low angle boundaries with misorientation angles smaller than 2 deg. Using the structural parameters-flow stress relationship, the flow stress was estimated based on the EBSD and TEM/Kikuchi-line analyses and compared with measured values.

Authors:
; ;  [1];  [2]
  1. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz (Iran, Islamic Republic of)
  2. Department of Adaptive Machine System, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871 (Japan)
Publication Date:
OSTI Identifier:
21140773
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 59; Journal Issue: 9; Other Information: DOI: 10.1016/j.matchar.2007.11.006; PII: S1044-5803(07)00374-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; BACKSCATTERING; CORRELATIONS; DEFORMATION; ELECTRON DIFFRACTION; FLOW STRESS; GRAIN BOUNDARIES; IMPURITIES; KIKUCHI LINES; PRESSING; SURFACES; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Reihanian, M, Ebrahimi, R, Moshksar, M M, Terada, D, and Tsuji, N. Microstructure quantification and correlation with flow stress of ultrafine grained commercially pure Al fabricated by equal channel angular pressing (ECAP). United States: N. p., 2008. Web. doi:10.1016/j.matchar.2007.11.006.
Reihanian, M, Ebrahimi, R, Moshksar, M M, Terada, D, & Tsuji, N. Microstructure quantification and correlation with flow stress of ultrafine grained commercially pure Al fabricated by equal channel angular pressing (ECAP). United States. doi:10.1016/j.matchar.2007.11.006.
Reihanian, M, Ebrahimi, R, Moshksar, M M, Terada, D, and Tsuji, N. Mon . "Microstructure quantification and correlation with flow stress of ultrafine grained commercially pure Al fabricated by equal channel angular pressing (ECAP)". United States. doi:10.1016/j.matchar.2007.11.006.
@article{osti_21140773,
title = {Microstructure quantification and correlation with flow stress of ultrafine grained commercially pure Al fabricated by equal channel angular pressing (ECAP)},
author = {Reihanian, M and Ebrahimi, R and Moshksar, M M and Terada, D and Tsuji, N.},
abstractNote = {Commercial purity Al was severely deformed by equal channel angular pressing (ECAP) up to eight passes using route B{sub C}. The deformation microstructure was characterized quantitatively by electron-backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The microstructural homogeneity was investigated by EBSD at various locations from center to surface of the samples on a longitudinal section parallel to the pressing direction. Structural parameters including mean boundary spacing, boundary misorientation angle and fraction of high angle grain boundaries were measured and characterized through the section of the ECAP samples. EBSD scans revealed a homogeneous ultrafine grained microstructure after 8 passes. The analysis showed that the fraction of high angle grain boundaries was more than 70% at most locations of the sample section. Also, an average boundary spacing of 380 nm was obtained by the linear intercept method. TEM analysis was used for more detailed characterization of the microstructure, such as low angle boundaries with misorientation angles smaller than 2 deg. Using the structural parameters-flow stress relationship, the flow stress was estimated based on the EBSD and TEM/Kikuchi-line analyses and compared with measured values.},
doi = {10.1016/j.matchar.2007.11.006},
journal = {Materials Characterization},
issn = {1044-5803},
number = 9,
volume = 59,
place = {United States},
year = {2008},
month = {9}
}