1. Department of Mechanical Engineering, University of New Mexico, Albuquerque, New Mexico 87131
2. Los Alamos National Lab, Los Alamos, New Mexico 87545, and University of New Mexico National Lab Professor, Department Of Mechanical Engineering, Albuquerque, New Mexico 87131
3. Toyota Technical Center, U.S.A. Inc, Materials Research Department, Ann Arbor, Michigan 48105