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Chemical and topological order in shear bands of Cu64Zr36 and Cu36Zr64 glasses
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Image of FIG. 1.
FIG. 1.

(a) Stress-strain curves for metallic glasses under tensile deformation. In the (b) Cu64Zr36 glass as well as in the (c) Cu36Zr64 glass plastic deformation occurs highly localized in one dominant shear band.

Image of FIG. 2.
FIG. 2.

Changes in CSRO during tensile deformation in both glassy alloys measured by the variation in the nearest neighbor correlation indeces Cij (with i,j = Cu, Zr). The Cij -values were calculated for a test volume inside the SB and in the surrounding matrix.

Image of FIG. 3.
FIG. 3.

Linear scans of (a),(c) the average Voronoi volume around Cu-atoms, and (b),(d) the fraction of Cu-centered full icosahedra at different strains during deformation of a (a),(b) Cu64Zr36 and a (c),(d) Cu36Zr64 glass.

Image of FIG. 4.
FIG. 4.

Population of Cu- and Zr-centered Voronoi polyhedra in (a),(b) Cu-rich and (c),(d) Zr-rich metallic glass for the undeformed material, inside a shear band and in the surrounding matrix. Only VPs with an initial population of more than 3% are considered.

Image of FIG. 5.
FIG. 5.

Evolution of the total number of FIs in addition to the destruction and creation of FIs during tensile deformation with respect to the number of Cu-atoms: (a) in the SB and (b) in the matrix of the Cu-rich alloy; (c) in the SB and (d) in the matrix of the Zr-rich alloy.

Image of FIG. 6.
FIG. 6.

Evolution of average Voronoi volumes of FIs remaining from the original SRO (=old FI) and newly formed FIs (=new FI) in SB and matrix during deformation (a) for the Cu-rich glass and (b) for the Zr-rich glass.

Image of FIG. 7.
FIG. 7.

Changes in cross-linking between FI-units during tensile deformation for a (a),(b) Cu36Zr64- and a (c),(d) Cu64Zr36 glass: Fraction of FI-units with a certain number of FI-neighbors NFI measured for a test volume inside the SB and in the surrounding matrix as a function of the applied strain. (e) Example of an extended MRO-cluster consisting of FI units; only the center atoms of the FI-clusters are shown and colored according to the corresponding NFI .

Image of FIG. 8.
FIG. 8.

Changes in the average size of MRO-clusters nav , which is the average number of FI-units per MRO-cluster, during deformation.

Image of FIG. 9.
FIG. 9.

Evolution of MRO-clusters during deformation inside a shear band in (a) a Cu36Zr64 glass and (b) a Cu64Zr36 glass: For better illustration, only FIs in a slice of the thickness of one FI-unit are displayed; the sections are chosen inside a shear band and the size of the boxes is 9 × 8 nm2. Red atoms represent FI-centers and blue atoms are located in their first coordination shell.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Chemical and topological order in shear bands of Cu64Zr36 and Cu36Zr64 glasses