1. Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, Escola de Engenharia, Bloco 2, sala 2233, Av. Antônio Carlos, 6627, Pampulha, 31.270-901, Belo Horizonte, MG, Brazil, and Department of Materials Science and Engineering and Biomedical Engineering, University of Florida, 317 MAE, P.O. Box 116400, Gainesville, Florida 32611-6400