1. CAS Key Laboratory of CryogenicsTechnical Institute of Physics and ChemistryBeijing100190P. R. China
2. Laboratory for Excellence in Advanced Steel ResearchDepartment of MetallurgicalMaterials and Biomedical Engineering, University of Texas at El Paso500 W. University AvenueEl PasoTX79968‐0520USA
3. Department of Mechanical and Electrical EngineeringXiamen UniversityXiamen361005P. R. China