Details

Autor(en) / Beteiligte

• Kauffmann, A.
• Freudenberger, J.
• Klauß, H.
• Klemm, V.
• Schillinger, W.
• Subramanya Sarma, V.
• Schultz, L.

Titel

Properties of cryo-drawn copper with severely twinned microstructure

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2013-12, Vol.588, p.132-141

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• We present the work hardening behaviour, mechanical and electrical properties of pure copper subjected to wire drawing at 77K and 295K, 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 77K. The onset of deformation twinning for wire drawing at 77K 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.