Abstract
The β-relaxation is attributed to the localized motion of constituent atoms in the localized regions of bulk metallic glasses (BMGs). Here, the β-relaxation behavior and the mechanical performance of a series of LaCe-based BMGs with various chemical compositions were investigated by adjusting or replacing constituent elements. For (La40Ce60)65Al10+xCo25−x (x = 0, 5, 10) BMGs, prominent β-relaxation was observed, and the relaxation temperature (Tβ) increased with Al content. The substitution of Co with Ni increased Tβ, whereas the substitution of Co with Cu suppressed the β-relaxation. The results of compression testing at room temperature showed that once the deformation temperature was close to the activating temperature of the β-relaxation, potential shear transformation zones could be activated due to the activated atomic mobility caused by applied stress. Thus, plastic deformation could be accommodated.
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