1. School of Mechanical, Industrial and Manufacturing Engineering Oregon State University Corvallis OR 97331-6001 USA
2. Department of Metallurgical and Materials Engineering Universidade Federal de Minas Gerais Belo Horizonte MG 31270-901 Brazil
3. Nosov Magnitogorsk State Technical University Magnitogorsk 455000 Russia
4. Institute for Metals Superplasticity Problems Russian Academy of Sciences Ufa 450001 Russia