1. Department of Materials Science & NanoEngineering, Rice University, Houston, Texas 77005, United States
2. Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77840, United States
3. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Ohio 45433-7750, United States
4. United States Air Force Academy, Colorado Springs, Colorado 80840, United States