1. a Department of Materials Science and Engineering , University of Virginia , Charlottesville , Virginia , 22903 , U.S.A.
2. b WL/MLPJ, Bldg 651, 3005 P St., Ste 1, Wright-Patterson AFB, Ohio , 45433-7702
3. c Wright Laboratory, Materials Directorate , WL/MLPJ Wright-Patterson AFB, Ohio , 45433 , U.S.A.