Corrosion resistance investigation of the Ti–Al–Mo system supported by CALPHAD approach and key experiments

• Published in: Corrosion science Vol. 229; p. 111857
• Main Authors: Zeng, Gang, Hu, Biao, Shi, Yuchao, Lan, Xinyue, Yin, Huiqin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2024
• Subjects: Alloy design; Corrosion resistance; Gibbs energy; Thermodynamic calculations; Ti–Al–Mo system; Gibbs energy; Corrosion resistance; Ti–Al–Mo system; Thermodynamic calculations; Alloy design
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2024.111857

The corrosion resistance of Ti–Al–Mo alloys in seawater were investigated by thermodynamic calculations and electrochemical tests. Four as-cast alloys were designed based on thermodynamic calculations. The calculated results were verified by experimental determination. The Gibbs energy and electrochemical experiment results showed Ti55Al40Mo5 alloy has the most positive Gibbs energy and the best corrosion resistance. The bcc(Ti) phase has best corrosion resistance among AlTi, AlTi3 and bcc(Ti). The present work further proves the important role of phase diagram calculation in alloy design, and thermodynamic database provides important theoretical support for efficient development of new alloys. •The thermodynamic assessment of the Ti–Al–Mo system was carried out by the CALPHAD method.•The solidification paths of as-alloys were simulated by the Gulliver-Scheil model.•The Gibbs energy of each phase in the as-alloys were calculated by the point calculation module.•The corrosion resistance of the as-alloys in seawater was investigated by electrochemical tests.•The calculated corrosion resistance of each phase in as-alloys is in agreement with the experimental results.