Hydrogenation of body-centered-cubic titanium-chromium alloys prepared by mechanical grinding

摘要

The C15 and C14 intermetallic TiCr{sub}(2-x) (x = 0, 0.2 and 0.5) compounds were subjected to grinding in a high-energy ball mill. The X-ray diffraction profiles showed that the crystal structure transformed from C15 and C14 to bcc after mechanical grinding for 57.6 ks. The hydrogenation properties of the TiCr{sub}(2-x) (x = 0, 0.2 and 0.5) samples were examined by differential thermal analysis and pressure-composition isotherm measurements. The sample reacted with hydrogen at S MPa and 523 K by maintaining the bcc structure. An higher hydrogen content was observed for the sample with the higher Ti content. The maximum hydrogen content of TiCr{sub}2.0, TiCr{sub}1.8 and TiCr{sub}1.5 was found to be about 0.32, 0.36 and 0.47 H/M at 313 K, respectively, at 8 MPa.