J. H. Chen is a professor in the Faculty of Materials Science and Engineering of Lanzhou University of Technology in China. From 1985 to 1995 he served as President of Gansu University of Technology (now Lanzhou University of Technology). From 2000 to 2003 he was President of the China Welding Society. Dr. Chen has devoted himself to the investigation of the micromechanism of cleavage fracture of metals for more than thirty years and published 70 papers on this subject in international journals.
R. Cao, Dr. of Engineering, is a professor in the Faculty of Materials Science and Engineering of Lanzhou University of Technology in China. She has been investigating the fracture behavior of TiAl alloys and welded dissimilar metals since 2000 and published more than 25 papers on these subjects in international journals.