[1] Ames Laboratory, Metal and Ceramic Sciences, Iowa State University, Ames, IA 50011, United States
[2] Dept. of Mat. Sci. and Engineering, Iowa State University, Ames, IA 50011, United States
[3] Clark Associates, Adelphi, MD 20783, United States
[4] Naval Surface Warfare Center, Carderock Division, Code 645, W. Bethesda, MD 20817, United States