Abstract
An intrinsically plastic Zr 53.8Cu 31.6Ag 7.0Al 7.6 bulk metallic glass with large bending and compressive plastic strains was fabricated. Through transmission electron microscopy, three-dimensional atom probe and anomalous small-angle X-ray scattering techniques, the possibility of plasticity induced by microstructural and chemical inhomogeneity was ruled out in the as-cast alloy. The plasticity can change dramatically in a narrow composition range, even though all the other properties vary slightly or even do not change. In comparison with Zr 46Cu 37.6Ag 8.4Al 8, the increase in Zr content in Zr 53.8Cu 31.6Ag 7.0Al 7.6 results in an increased portion of the Zr–Zr atomic pair in the nearest shell of a pair distribution function. A steep peak profile on the right side of the pair distribution function in Zr 53.8Cu 31.6Ag 7.0Al 7.6 suggests that more atoms are involved upon yielding, and the opportunity of forming more shear bands increases. This finding may provide useful guidelines for the development of plastic metallic glasses from a structural aspect.
Published Version
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