Internal friction and mechanical strength of hydrogenated Ti-rich multicomponent glassy alloys

The hydrogen-induced internal friction and mechanical strength of the Ti-rich Ti₃₄Zr₁₁Cu₄₇Ni₈ and (Ti ₃₄Zr₁₁Cu₄₇Ni₈)₉₈Si ₂ hydrogenated glassy alloys have been investigated. It is found that the tensile strength is more than 0.8 GPa at room temperature when the hydrogen content is below about 20 at% for both alloys. The frequency dependence of peak temperature of the hydrogen-induced internal friction of (Ti ₃₄Zr₁₁Cu₄₇Ni₈)₉₈Si ₂-17.3 at%H hydrogenated glassy alloys has been clarified. Activation energy and pre-exponential factor are estimated to be 0.35 eV and 1.3×10^-12, respectively. Compared with these values with those of Zr₄₀Cu₄₉Al₁₀Si₁ hydrogenated glassy alloys which show an internal friction peak around 300 K at about 300 Hz, it is found that the activation energy is much smaller than that of the latter although the pre-exponential factor is almost the same. Considering their similar composition and different component (Al), it is suggested that the component Al of the latter glassy alloys is effective for the higher activation energy which results in the increase of the peak temperature.