Abstract

CASTRO, José Fernando Ribeiro de; SANTOS, Sydney Ferreira; ISHIKAWA, Tomaz  and  BOTTA, Walter José. Processing and microstructural characterization of a Ti-Cr-Nb alloy synthesized by high-energy ball-milling. Mat. Res. [online]. 2012, vol.15, n.5, pp. 753-756.  Epub June 19, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000061.

Ti-based body centered cubic (BCC) solid solutions are promising materials for hydrogen storage. These alloys are usually synthesized by melting processes and have large amounts of vanadium as alloying element to stabilize the BCC phase at room temperature. In this work high energy ball-milling was evaluated as processing route for a Ti - based BCC solid solution. Moreover, the feasibility of Nb as stabilizer for the BCC phase is also investigated. The results show that the BCC phase is rapidly formed by ball-milling. After 2 hours of milling the alloy is mainly composed by BCC phase. Moreover, the time of milling must be limited in order to minimize the contamination with iron promoted by the wearing of milling balls and vials.

Keywords : hydrogen storage materials; metal hydrides; Ti - based bcc solid solution.