1. Metallurgical and Materials Engineering Department, Polytechnic School, São Paulo University. Av. Professor Mello de Moraes, 2463, 05508-030 São Paulo, SP, Brazil.
2. Materials Engineering Department, FEI University. Av. Humberto de Alencar Castelo Branco, 3972, office K5-01, 09850-901 São Bernardo do Campo, SP, Brazil.