Regensburg 2004 – scientific programme

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M: Metallphysik

M 27: Mechanische Eigenschaften IV

M 27.3: Talk

Thursday, March 11, 2004, 12:15–12:30, H4

Mechanical properties of ECAP–deformed copper — •Aikaterini Zi¹, Ralph J. Hellmig¹, Min Hong Seo², Hyoung Seop Kim² und Juri Estrin¹ — ¹Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, Agricolastr. 6, 38678 Clausthal-Zellerfeld — ²Department of Metallurgical Engineering, Chungnam National University, Daejeon, Korea

Ultrafine grained copper was produced using ECAP (equal channel angular pressing) following the well known processing Route C up to 8 passes. Using transmission electron microscopy a cell structure having a medium cell size of 200 nm having a log–normal size distribution was observed. The deformed copper shows a strong increase in tensile strength accompanied by a loss in ductility directly after pressing. To investigate the homogeneity of ECAP processed specimens, Vickers hardness maps with a small imprint spacing were determined. They reflect the strain inhomogeneity inside the specimens due to die geometry and strain hardening. After several ECAP passes a more homogeneous hardness distribution was observed.