1. Mr Zhang (), Drs van den Bos, Sloof and Professor de Wit are in the Department of Materials Science and Technology, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands. Professor Terryn is at the Netherlands Institute for Metals Research, Rotterdamseweg 137, PO Box 5008, 2600 GA Delft, The Netherlands. Dr Hovestad is at TNO Institute of Industrial Technology, PO Box 6235, 5600 HE Eindhoven, The Netherlands.