1. Division of Materials Science and Engineering, Department of Mechanical Engineering, Univ. of Akron, Akron, OH 44325-3903, US.
2. Division of Materials Science and Engineering, Department of Mechanical Engineering, Univ. of Akron, Akron, OH 44325-3903, US (Corresponidng author), e-mail: tsrivatsan@uakron.edu
3. Department of Geology, Univ. of Akron, Akron, OH, 44324-3903, US.