Affiliation: | aLaboratory of Materials Modification by Laser, Electron, and Ion Beams, Dalian University of Technology, Dalian 116024, China;bCollege of Advanced Science and Technology, Dalian University of Technology, Dalian 116024, China;cInstitute of Materials Engineering, University of Siegen, Paul-Bonatz-Straße 9-11, D-57076 Siegen, Germany |