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This research explores how the addition of Re or W influences the oxidation behavior of a Ta–Mo–Cr–Ti–Al alloy at high temperatures.

April 16, 2026Open Access

Effect of Re or W Addition on the Oxidation Behaviour of a Compositionally Complex Ta–Mo–Cr–Ti–Al Alloy in Air at 1000°C

Key Points

This research explores how the addition of Re or W influences the oxidation behavior of a Ta–Mo–Cr–Ti–Al alloy at high temperatures.
Conducted oxidation tests at 1000°C in air for Ta–Mo–Cr–Ti–Al alloy with 3 at.% Re or W.
Measured parabolic mass gain over 72 hours to assess oxidation resistance.
Examined thickness of oxide layers and internal corrosion zones after 100 hours.
Both Re and W additions reduced the parabolic mass gain during oxidation tests.
W addition showed decreased oxide layer thickness and internal corrosion zones compared to the control.
Identification of (Ti,Ta)O2 with Mo inclusions beneath (Cr,Ta,Ti)O2 layers is noted.

Abstract

ABSTRACT Presuming that doping of protective (Cr,Ta,Ti)O 2 with cations of +5 or higher valence further improves the oxidation resistance of Ta–Mo–Cr–Ti–Al, the effect of 3 at.% of Re or W in otherwise equimolar Ta–Mo–Cr–Ti–Al is investigated in oxidation tests performed at 1000°C in air. Both minor additions indeed decrease the parabolic mass gain (72 h), which for W also manifests in reduced thickness of oxide layers and zone of internal corrosion that persists for at least 100 h. Besides the hypothesised doping, other factors that may explain the effect of Re or W are discussed. A general finding of the analytical work is the identification of (Ti,Ta)O 2 with Mo inclusions underneath the inward growing (Cr,Ta,Ti)O 2 layer.

Effect of Re or W Addition on the Oxidation Behaviour of a Compositionally Complex Ta–Mo–Cr–Ti–Al Alloy in Air at 1000°C

Key Points

Abstract

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