Influence Mechanism of Cu on High Temperature Oxidation Behavior of Titanium Alloys

Abstract:

The oxidation behavior and mechanism of Ti-Cu alloys (0≤w(Cu)≤20%) in the temperature range of 1000°C～1300°C are studied by thermogravimetric analysis(TGA) combined with SEM, EDS and XRD analysis methods. The results show that the oxidation rates of Ti-Cu alloys increase sharply when the temperature rises above 1000°C. The oxidation products have a three-layer structure, from the outside to the inside, which are dense outer oxide layer of TiO₂, porous inner oxide layer of low valence oxide of Ti and Cu-enriched layer. With the increase of the temperature, the thicknesses of oxide layers of Ti-Cu alloy increase and the Cu-enriched phase increases gradually and melts. The melting Cu-enriched phase flows to the oxidation surface along the grain boundaries of the oxide layer. The high temperature oxidation resistance of Ti-Cu alloys declines with the increase of Cu content. The main reason is that more liquid Cu-enriched phase is formed and flows to the oxidation surface along the oxide grain boundaries in the Ti-Cu alloy, and Ti and O ions can diffuse more easily along the liquid Cu-enriched phase, which increases the oxidation rates.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 110-119
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.110
• Online since: January 2019
• Authors: Hang Chen, Guang Bao Mi*, Pei Jie Li, Chun Xiao Cao
• Keywords: High Temperature Oxidation, Mechanism, Oxidation Product, Thermogravimetric Analysis (TGA), Ti-Cu Alloy

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