EFFECT OF ATMOSPHERE ON OXIDATION OF Ti-6Al-4V ALLOY Danieli Aparecida Pereira Reis, Cosme Roberto Moreira da Silva, Maria do Carmo de Andrade Nono, Miguel Justino Ribeiro Barboza, Francisco Piorino Neto, Carlos de Moura Neto e Sergio Frascino M.de Almeida
Resumo: The objective of this work was to evaluate the oxidation on creep behavior of the Ti-6Al-4V alloy focusing on determination of the experimental parameters related to the creep stages. Constant load creep tests were conducted with Ti-6Al-4V alloy in air and in nitrogen atmosphere at 500°C, 600°C and 700°C. Results indicated the creep resistance of the alloy in nitrogen atmosphere is greater than in air. Previously reported results about the activation energies and stress exponents' values indicate that the primary and stationary creep, for both test conditions, was probably controlled by dislocation climb. The decrease in ductility after creep in air is larger than creep under nitrogen atmosphere due to oxidation and surfaces cracks.
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