Abstract
The study investigated the high-temperature oxidation behaviour of Ti65 titanium alloy fabricated by laser direct energy deposition (LDED). Results showed that the formation of multiple oxide layers (OL) better protected the matrix at 650 ℃, 750 ℃, and 850 ℃. The oxidation resistance improved with an activation energy of 282 ± 1.4 kJ·mol−1. A mathematical model to predict the relationship of oxidation was established through temperature-compensated time parameters, and it accurately predicted the oxidation mass gain and oxygen dissolution zone (ODZ) thickness. Ultimately, the mechanism of high-temperature oxidation resistance has been methodically elucidated.
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