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TECHNICAL PAPERS

Investigation of the Microstructural Evolution During Large Strain Cold Working of Metals by Means of Synchrotron Radiation—A Comparative Overview

[+] Author and Article Information
M. Zehetbauer, E. Schafler, I. Kopacz

Institute of Materials Physics, University of Vienna, A-1090 Wien, Strudlhofgasse 4, Austria

T. Ungár

Department of General Physics, Eötvös University Budapest, H-1518 Budapest, Pazmany Peter Setany 1/A, Hungary

S. Bernstorff

Sincrotrone ELETTRA, I-34012 Trieste, Basovizza, Italy

J. Eng. Mater. Technol 124(1), 41-47 (Jul 03, 2001) (7 pages) doi:10.1115/1.1421049 History: Received April 06, 2001; Revised July 03, 2001
Copyright © 2002 by ASME
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References

Figures

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Sketch of (a) a polarized dipole wall (PDW) (b) a polarized tilt wall (PTW) consisting of edge dislocations
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Cu: Formal dislocation density ρ* , long range internal stress |Δσw−Δσc| and dislocation arrangement parameter M, measured along spatial grain scans in the specimens cold-rolled to true strains ε as indicated. The vertical dashed lines indicate the location of grain boundaries. The measuring error of ρ* is of the order of the symbol size, the error of |Δσw−Δσc| at most ±5 MPa. (a) ε=0.086; (b) ε=0.79; (c) ε=2.24.
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Fe: Formal dislocation density ρ* , long range internal stress |Δσw−Δσc| and dislocation arrangement parameter M, measured along spatial grain scans in the specimens deformed to true strains ε by torsion at room temperature as indicated. The vertical dashed lines indicate the location of grain boundaries. The measuring error of ρ* is of the order of the symbol size, the error of |Δσw−Δσc| at most ±5 MPa. (a) ε=0.06; (b) ε=0.64; (c) ε=0.82.
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Ni: Formal dislocation density ρ* , long range internal stress |Δσw−Δσc| and dislocation arrangement parameter M, measured along spatial grain scans in the specimens cold-rolled to true strains ε as indicated. The vertical dashed lines indicate the location of grain boundaries. The measuring error of ρ* is of the order of the symbol size, the error of |Δσw−Δσc| at most ±5 MPa. (a) ε=0.11; (b) ε=0.62; (c) ε=0.91.
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Al: Formal dislocation density ρ* , long range internal stress |Δσw−Δσc| and dislocation arrangement parameter M, measured along spatial grain scans in the specimens cold-rolled to true strains ε as indicated. The vertical dashed lines indicate the location of grain boundaries. The measuring error of ρ* is of the order of the symbol size, the error of |Δσw−Δσc| at most ±5 MPa. (a) ε=0.11; (b) ε=0.78; (c) ε=1.
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Formal dislocation density ρ* , long range internal stress |Δσw−Δσc| and dislocation arrangement parameter M, measured along spatial grain scans in the specimens cold-rolled (a) Ni, ε=1.42, and (b) Al, ε=2.07. The vertical dashed line indicates the location of a grain boundary. The measuring error of ρ* is of the order of the symbol size, the error of |Δσw−Δσc| at most ±5 MPa.
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Evolution of true dislocation density ρ versus true equivalent strain ε, in (a) Cu and Fe, and (b) Ni and Al. The values have been obtained by averaging the scan data and appropriate correction of the contrast. For the dashed part of Fe-curve in (a), see footnote 1.
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Variation of the long range internal stresses |Δσw−Δσc| in cold worked (a) Cu and Fe, and (b) Ni and Al, with increasing true strain ε. The values have been obtained by averaging the scan data. The measuring error is at most ±5MPa. For the dashed part of Fe-curve in (a), see footnote 1.

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