Effect of hydrogen on internal friction and elastic modulus in titanium alloys

✍ Scribed by N.L. Arabajian; V.I. Serdobintsev; V.M. Tavkhelidze; T.A. Peradze; Yu.I. Stamateli; K.M. Gorgadze

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 386 KB
• Volume: 57
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.10.013

✦ Synopsis

The effect of hydrogen on the variation with temperature of internal friction (Q ÀI ) and elastic modulus (E) of a number of Ti-based alloys has been studied in the Hz and kHz frequency ranges. A relaxation peak of internal friction with a high degree of relaxation (Q ÀI max $ 10 À1 ) and with a DE effect is observed in all hydrogen-doped samples at T $ 600 K at $1 kHz, and at T $ 500 K at $1 Hz. Such a peak is not present in samples without hydrogen. The activation energy W and the frequency factor v 0 of the observed relaxation are determined to be W $ 1.55 eV, v 0 $ 10 17 s À1 . It is shown that the observed effects are connected with the mechanism of grain boundary relaxation, as the introduction of hydrogen into titanium alloys leads to the formation of fine-grained structures.