Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575645 | Materials Science and Engineering: A | 2013 | 10 Pages |
Abstract
We present the work hardening behaviour, mechanical and electrical properties of pure copper subjected to wire drawing at 77Â K and 295Â K, respectively. The deformation per pass is increased up to true strain of 0.4 by adopting pressure die/drawing die combinations in order to optimize lubricant residuals of MoS2 on the wire surface at 77Â K. The onset of deformation twinning for wire drawing at 77Â K was found to be 0.3 and 0.4 for a true strain of 0.1 and 0.4 per pass, respectively. Twinning activity, texture strength and homogeneity are enhanced by increasing deformation per pass while the number of processing steps required for a certain deformation are reduced significantly. A considerably altered electrical conductivity, medium strength increase accompanied with a loss of ductility and a limited thermal stability suggest the formation of non-coherent twin boundaries or destructed twin orientation relationship in cryo-drawn wires. Evidence was found for the latter possibility by local investigation of deformation twins in the final stage of deformation.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
A. Kauffmann, J. Freudenberger, H. KlauÃ, V. Klemm, W. Schillinger, V. Subramanya Sarma, L. Schultz,