1. Key Laboratory for Precision and Non‐Traditional Machining Technology of the Ministry of Education Dalian University of Technology Dalian 116024 China
2. School of Materials Engineering Purdue University West Lafayette IN 47907 USA
3. Department of Physics Northwestern Polytechnical University Xi'an 710072 China
4. Department of Material Science and Engineering Frederick Seitz Material Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA