Berlin 2005 – wissenschaftliches Programm

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M: Metallphysik

M 24: Nanoskalige Materialien III

M 24.2: Vortrag

Samstag, 5. März 2005, 15:00–15:15, TU H111

Modeling of the ECAP process: Misorientation evolution — •Ralph Jörg Hellmig¹, Hyoung Seop Kim², and Juri Estrin¹ — ¹Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, Agricolastr. 6, 38678 Clausthal-Zellerfeld — ²Dept. of Metallurgical. Eng., Chungnam National University, Daejeon, 305-764, Korea

Using Equal Channel Angular Pressing (ECAP) an ultrafine grained microstructure can be achieved. It has been demonstrated that FEM calculations based on a dislocation density related constitutive model are a suitable method to describe the structure refinement as well as the evolution of mechanical properties and overall texture [1,2]. So far, the evolution of the average misorientation between neigbouring dislocation cells was not included in this model description. A simple extension based on experimental evidences introduced in the FEM code allows to trace the evolution of the average misorientation angle. Results of modeling will be compared with experimental data.

[1] S.C. Baik, R.J. Hellmig, Y. Estrin, H.S. Kim; Z. Metallkd. 94 (2003) 754.

[2] S.C. Baik, Y. Estrin, R.J. Hellmig, H.T. Jeong, H.G. Brokmeier, H.S. Kim; Z. Metallkd. 94 (2003) 1189.