Abstract
Strain localization during plastic deformation drastically reduces the shear band stability in metallic glasses, ultimately leading to catastrophic failure. Therefore, improving the plasticity of metallic glasses has been a long-standing goal for several decades. In this regard, nanoglass, a novel type of metallic glass, has been proposed to exhibit differences in short and medium range order at the interfacial regions, which could promote the formation of shear transformation zones. In the present work, by introducing heterogeneities at the nanoscale, both crystalline and amorphous, significant improvements in plasticity are realized in micro-compression tests. Both amorphous and crystalline dispersions resulted in smaller strain bursts during plastic deformation. The yield strength is found to increase significantly in Cu–Zr nanoglasses compared to the corresponding conventional metallic glasses. The reasons for the mechanical behavior and the importance of nanoscale dispersions to tailor the properties is discussed in detail.Graphic
Highlights
Metallic nanoglasses are an emerging class of amorphous materials characterized by glassy core regions surrounded by interfaces, similar to grain boundaries in crystalline materials [1,2,3,4]
The amorphous nature of the consolidated Cu50Zr50 nanoglass was verified by X-ray diffraction (XRD)
This result fits to the chemical inhomogeneity observed in a Cu–Zr nanoglass in molecular dynamic (MD) simulations, where ~ 10 at.% segregation was noticed between the core and the interface regions [17]
Summary
Metallic nanoglasses are an emerging class of amorphous materials characterized by glassy core regions surrounded by interfaces, similar to grain boundaries in crystalline materials [1,2,3,4]. Such interfacial regions distributed at a length scale on the order of 5–10 nm, are characterized by a different chemistry and enhanced free volume compared to the core of the glassy grains. Properties like ferromagnetism, enhanced bio-compatability, improved glucose detection and increased thermal stability are some of the properties improved in nanoglasses when compared to the metallic glasses of a similar composition [5,6,7,8,9,10,11]. The role of the interfacial structure on these properties seems to elude us until now
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