Feasibility study of hydrogenated amorphous alloys as high-damping materials

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Abstract The hydrogen internal friction peak (HIFP) and the tensile strength, σ f , in amorphous (denoted by ‘a’) Zr 60− y Cu 30 Al 10 Si y ( y =0, 1) and a-Zr 40 Cu 50− x Al 10 Si x ( x =0, 1) alloys are investigated as a function of the hydrogen concentration, C H . The drastic increase in the peak temperature, T p , of the HIFP due to the Si addition by 1 at.% is found for the a-Zr 40 Cu 49 Al 10 Si 1 , where the decrease in 1/ τ 0 ( τ 0 denotes the pre-exponential factor of the relaxation time for the HIFP) from 1.5×10 12 s −1 to 3.0×10 10 s −1 is observed. On the other hand, the increase in T p due to the Si addition by 1 at.% is much smaller for a-Zr 59 Cu 30 Al 10 Si 1 , where 1/ τ 0 for the HIFP in a-Zr 60 Cu 30 Al 10 is already as low as that for a- Zr 40 Cu 49 Al 10 Si 1 . For the HIFP with the peak height, Q p −1 , beyond 1×10 −2 , Q p −1 in the as-charged state decreases after heating to about 380 K because of the hydrogen induced structural relaxation (HISR). The HIFP with Q p −1 below 1×10 −2 is rather stable against the HISR. It is suggested that the highly anisotropic local strain around a hydrogen atom is responsible for the very high Q p −1 and the HISR. For the high-strength and high-damping performance, σ f is higher than 1.5 GPa and Q p −1 after the HISR is slightly lower than 1×10 −2 for the present Zr–Cu–Al–(Si) a-alloys.