Stability and hydrogen-induced internal friction of Ti-rich multicomponent glassy alloys

Hydrogen-induced internal friction behavior of ternary Ti ₃₇Zr₁₂Cu₅₁ and quaternary Ti ₃₄Zr₁₁Cu₄₇Ni₈, which is also expressed by (Ti_0.37Zr_0.12Cu_0.51) ₉₂Ni₈, glassy alloys with a wide supercooling region have been investigated by measuring temperature dependence of internal friction above 90K. It is found that they show a broad peak depending hydrogen content. With increasing hydrogen content, the peak internal friction of both glassy alloys increases, while the peak temperature decreases. It should be noted that the peak internal friction of quaternary Ti₃₄Zr₁₁Cu ₄₇Ni₈ glassy alloys are larger than that of ternary Ti₃₇Zr₁₂Cu₅₁ glassy alloys in the hydrogen content dependence of the peak internal friction. This is attributable to the increase of local strain anisotropy due to the change of local atomic arrangement when adding Ni, i.e. the change from ternary to quaternary. On the other hand, there are no distinguished effects of the change on the hydrogen content dependence of the peak temperature, suggesting changes not only the activation energy but also the frequency factor (pre-exponential factor) in the relaxation process by the change.