Abstract
The bending and nanomechanical behaviors of a Zr55Cu30Ni5Al10 bulk metallic glass were investigated in the present work via melt hydrogenation. The room temperature bending plasticity of samples after hydrogen addition is observed improving gradually with the increase of addition amount. A softening phenomenon is appeared in the results of nanoindentation, concomitantly with a decrease in the elastic modulus of the samples. A simple “spacer” model of hydrogen atoms can be used to describe for the softening behaviors of the Zr55Cu30Ni5Al10 samples prepared by melt hydrogenation in this work. The “spacer” can enhance the distance of the metal atoms and decrease the corresponding atomic cohesion which is represented as the elastic modulus. The local changes of the atomic configuration give rise to the emergence of large void structures which will facilitate the local atomic displacement. Consequently, the “spacer” effect promotes the shear band proliferation and weakens the local shear deformation, and this in turns, leads to the large plastic deformation in the amorphous alloy. The results may have some implications for improving the plasticity of bulk metallic glass and understanding its hydrogen-induced softening.
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