1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China
2. Technical Monitoring Center, Petro China Changqing Oil Field Company, Xi'an, 710018, P. R. China
3. Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, P. R. China