Phase transformations in Ti2Cu under destructive hydrogenation and recombination

• Published in: Powder metallurgy and metal ceramics 2010-07, Vol.49 (3-4), p.220-226
• Main Authors: Bratanich, T. I., Skorokhod, V. V., Kucheryavyi, O. V., Kopylova, L. I., Krapivka, N. A.
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Glass; Materials Science; Metallic Materials; Natural Materials
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-010-9225-5

The thermodynamic possibility and conditions of Ti 2 Cu hydrogenation and recombination are assessed. The mechanism of Ti 2 Cu interaction with hydrogen between 293 and 973 K at pressure 1.0 MPa is studied. The interaction of Ti 2 Cu with hydrogen is thermodynamically possible in the destructive hydrogenation region over a wide temperature range. X-ray diffraction shows that destructive hydrogenation products are titanium dihydride and copper-rich intermetallic phases and copper depending on reaction conditions. According to the established mechanism of Ti 2 Cu destructive hydrogenation, hydrogen selectively interacts with titanium leaving Ti2Cu composition as follows: β-TiH y (bct-bcc) → TiH 1.92 (fcc). The initial Ti 2 Cu composition is recombined from destructive hydrogenation products (titanium dihydride and copper) in vacuum and hydrogen. The minimum temperature of Ti 2 Cu vacuum recombination is 1050 K and ensures complete TiH 2 decomposition. The recombination of Ti 2 Cu in hydrogen can occur at temperatures above 907 K.