1. Graduate Program in Materials Science and Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235 SP-310, 13565-905 São Carlos, São Paulo, Brazil
2. George S. Ansell Department of Metallurgical and Materials Engineering, Colorado School of Mines, 1500 Illinois St., Golden, Colorado 80401, USA
3. Department of Materials Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235 SP-310, 13565-905 São Carlos, São Paulo, Brazil