Tensile behavior of Cu50Zr50 metallic glass nanowire with a B2 crystalline precipitate
Author
dc.contributor.author
Sepúlveda Macias, Matías
Author
dc.contributor.author
Amigo, Nicolás
Author
dc.contributor.author
Gutiérrez Gallardo, Gonzalo
Admission date
dc.date.accessioned
2018-07-27T16:36:33Z
Available date
dc.date.available
2018-07-27T16:36:33Z
Publication date
dc.date.issued
2018
Cita de ítem
dc.identifier.citation
Physica B: Condensed Matter, 531 (2018): 64–69
es_ES
Identifier
dc.identifier.other
10.1016/j.physb.2017.12.005
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/150388
Abstract
dc.description.abstract
A molecular dynamics study of the effect of a single B2–CuZr precipitate on the mechanical properties of Cu50Zr50
metallic glass nanowires is presented. Four different samples are considered: three with a 2, 4 and 6 nm radii
precipitate and a precipitate-free sample. These systems are submitted to uniaxial tensile test up to 25% of
strain. The interface region between the precipitate and the glass matrix has high local atomic shear strain,
activating shear transformation zones, which concentrates in the neighborhood of the precipitate. The plastic
regime is dominated by necking, and no localized shear band is observed for the samples with a 4 and 6 nm
radii precipitate. In addition, the yield stress decreases as the size of the precipitate increases. Regarding the
precipitate structure, no martensitic phase transformation is observed, since neither the shear band hit the
precipitate nor the stress provided by the tensile test is enough to initiate the transformation. It is concluded
that, in contrast to the case when multiple precipitates are present in the sample, a single precipitate concentrates
the shear strain around its surface, eventually causing the failure of the nanowire.