Abstract
Vit105 (Zr52.5Cu17.9Ni14.6Al10Ti5 at. %) bulk metallic glass samples were processed by high-pressure torsion and accumulative high-pressure torsion. By DSC, XRD and SANS methods it was shown that accumulative high-pressure torsion allows for achieving high real strains and leads to an increase in the free volume and significant transformation of the structure. Minor crystallization was detected after high-pressure torsion processing.
Highlights
High strength, large elastic strain limit, good corrosion resistance and other unique properties provide a great potential for the commercial application of bulk metallic glasses (BMGs)
Fragmentation appears on rings on selected area electron diffraction (SAED) images, taken from an area of 60 nm in diameter (Figure 1b, inset), while high-resolution TEM (HRTEM) (Figure 1b) photos reveal some fringes that might mean some kind of ordering in the structure
accumulative high pressure torsion” (ACC HPT) processing for nΣ = 10 leads to an increase in ∆V by ≈2%, and the increase in the full width at half maximum (FW HM)
Summary
Large elastic strain limit, good corrosion resistance and other unique properties provide a great potential for the commercial application of bulk metallic glasses (BMGs). The structure of bulk metallic glasses determines their mechanical properties [1,2,3]. The deformation of BMG occurs via the formation of shear bands (SB), and BMGs fracture along the very first shear band [1,2,4]. It is known that the formation of nanoscale heterogeneities—clusters and nanocrystals—can lead to an increase in plasticity. As shown in [5,6,7,8,9], preliminary deformation by rolling or compression enables the increase in ductility of amorphous alloys. The main idea of these routes is to form in BMGs nanometer-sized heterogeneities or to obtain amorphous structures consisting of nanoclusters [8]
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