Insights into the role of W/B alloying on high-temperature oxidation behavior of Ti42Al5Mn alloy

doi:10.1016/j.jmst.2023.09.011

Abstract

Abstract: In this study, the oxidation behavior of Ti42Al5Mn, Ti42Al5Mn0.5 W, Ti42Al5Mn0.5W0.1B, and Ti42Al5Mn0.8 W was investigated at 800 °C. Due to the inability to form a dense protective Al₂O₃ layer, Ti42Al5Mn suffered severe spallation during oxidation at 800 °C and the mass gain was significant. The intermediate layer between the scale and the substrate was first composed of Laves/Z phase but changed to α₂/Z phase with prolonged oxidation. The intermediate layer with high Ti/Al ratio favors the formation of a thick Al₂O₃ + TiO₂ mixed layer in the oxide scale which is prone to initiate cracks and cause the spalling of oxides. The doping of W in TiO₂ effectively inhibited its generation and promoted the formation of a dense Al₂O₃ layer, resulting in a significant improvement in the oxidation resistance of the alloy. Compared to Ti42Al5Mn alloy, Ti42Al5Mn0.8 W showed no spallation after 300 h cyclic oxidation and the kinetic curve changed from liner law to parabolic law. The intermediate layer of Ti42Al5Mn0.8 W alloy was composed of a single Laves phase and remained unchanged even after 1000 h oxidation at 800 ℃, offering a favorable basis for the generation of a stable protective oxide layer in the alloy. The addition of 0.1 at.% B to Ti42Al5Mn0.5 W alloy refined its microstructure and further improved its spallation resistance to a level close to that of Ti42Al5Mn0.8 W alloy.

Key words: β-γ-TiAl, High-temperature oxidation, Tungsten, Intermediate layer, Z phase

Pengxiang Zhao, Hui Ma, Xiaobing Li, Ming Gao, Yingche Ma, Kui Liu. Insights into the role of W/B alloying on high-temperature oxidation behavior of Ti42Al5Mn alloy[J]. J. Mater. Sci. Technol., 2024, 178: 188-200.

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