1. A. F. Ioffe Institute, 26, Politekhnicheskaya, St. Petersburg 194021, Russia
2. D. V. Efremov Institute, Metallostroy, 189631 St. Petersburg, Russia
3. Helsinki University of Technology Laboratory of Processing and Heat Treatment of Materials P.O. Box 6200, 02015 TKK, Finland
4. Outokumpu Drawn Copper Products, P.O. Box 60, FIN-28101 Pori, Finland
5. VTT Energy, Euratom-Tekes Association P.O. Box 1604, FIN-02044 VTT Finland