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Grain refinement in CuCrZr by SPD processing

Mariusz Kulczyk 1Beata A. Zyśk 2Malgorzata Lewandowska 2Krzysztof J. Kurzydlowski 2

1. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland


CuCrZr alloys exhibit relatively high strength (due to precipitation hardening) and high thermal and electrical conductivity which make them attractive for variety of applications, e.g. as heat sinks and electrodes. In the present study, a CuCrZr alloy was subjected to severe plastic deformation (SPD) to increase its strength by grain refinement without modification of the chemical composition. A combination of the multi-pass equal channel angular pressing (ECAP) followed by cumulative hydrostatic extrusion (HE) was applied with a total true strain of ~10. The microstructure of SPD samples was evaluated by transmission and scanning electron microscopy. The grains and particle size distributions were quantitatively described. The resulting mechanical properties were determined in tensile tests and via microhardness measurements. The results show that the applied SPD route, combining ECAP and HE, leads to high grain size refinement accompanied by high increase of strength. The possible improvement in life-time of electrodes made of CuCrZr alloy is discussed.


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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium H, by Mariusz Kulczyk
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-11 18:50
Revised:   2009-06-07 00:48