1. Graduate Program in Materials Science and Engineering; Federal University of Rio Grande do Norte; Avenida Senador Salgado Filho, 3000 59078-970 Natal RN Brazil
2. Department of Materials Science and Engineering; Federal University of Sergipe; Avenida Marechal Rondon s/n 49100-000 São Cristóvão SE Brazil
3. Department of Materials Engineering; Federal University of Rio Grande do Norte; Avenida Senador Salgado Filho, 3000 59078-970 Natal RN Brazil