Avaliação das propriedades mecânicas em alta temperatura da liga Ti-6Al-4V com e sem revestimento de barreira térmica para aplicações aeroespaciais
Evaluation of high-temperature mechanical properties of Ti-6Al-4V alloy with and without thermal barrier coating for aerospace applications
Bianca Costa Rodrigues, Renata Jesuina Takahashi, Luiz Felipe Pereira Soares, Lucas Caetano da Silva, Vera Lúcia de Óthero Brito, Danieli Aparecida Pereira Reis
Resumo
Este trabalho investigou algumas propriedades mecânicas importantes em alta temperatura para a liga Ti-6Al-4V com e sem revestimento de proteção térmica (TBC, Thermal Barrier Coating), visando aplicações aeroespaciais. Os corpos de prova foram ensaiados por tração a quente nas temperaturas de 23 °C, 500 °C, 550 °C e 600 °C, e foram submetidos à análise microestrutural inicial, análise das propriedades mecânicas obtidas durante o ensaio de tração a quente e análise fractográfica. Os resultados mostraram queda significativa dos limites de escoamento (σY) e resistência à tração (σr ) com o aumento da temperatura, acompanhada por aumento da ductilidade. A evolução da fratura em função da temperatura do ensaio, de moderadamente dúctil para altamente dúctil, foi confirmada visualmente pelo estereomicroscópio e pelo microscópio eletrônico de varredura, podendo ser associada a mecanismos como esferoidização da fase α e recristalização dinâmica. Na amostra revestida, observou-se menor resistência mecânica, mas a ductilidade manteve-se elevada e não houve fratura completa do revestimento. Conclui-se que o TBC na condição estudada contribui para a proteção térmica e manutenção da ductilidade da liga em ambientes térmicos severos, porém com perda significativa de resistência mecânica, exigindo controle adequado da espessura e dos parâmetros de processo.
Palavras-chave
Abstract
This study investigated key high-temperature mechanical properties of the Ti-6Al-4V alloy, both with and without a thermal barrier coating (TBC), aiming at aerospace applications. The specimens were subjected to hot tensile testing at temperatures of 23 °C, 500 °C, 550 °C, and 600 °C, along with initial microstructural analysis, analysis of the mechanical properties obtained during the hot tensile test, and fractographic analysis. The results showed a significant decrease in yield strength (σY) and tensile strength (σr ) with increasing temperature, accompanied by an increase in ductility. The evolution of the fracture mode as a function of the test temperature, from moderately ductile to highly ductile, was visually confirmed by stereomicroscopy and scanning electron microscopy, and may be associated with mechanisms such as α-phase spheroidization and dynamic recrystallization. In the coated sample, lower mechanical strength was observed, but ductility remained high and no complete failure of the coating occurred. It is concluded that the TBC under the conditions investigated contributes to thermal protection and to the maintenance of ductility of the alloy in severe thermal environments, but with a significant loss of mechanical strength, requiring adequate control of coating thickness and processing parameters.
Keywords
References
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Submitted date:
10/22/2025
Accepted date:
03/23/2026
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