TY - JOUR

T1 - Consolidation of the Amorphous Zr50Cu50 Ribbons by High-Pressure Torsion

AU - Gunderov, Dmitry

AU - Boltynjuk, Evgeniy

AU - Ubyivovk, Evgeniy

AU - Churakova, Anna

AU - Kilmametov, Askar

AU - Valiev, Ruslan

PY - 2019

Y1 - 2019

N2 - High-pressure torsion is used to consolidate the melt-spun Cu50Zr50 amorphous ribbons. The high-pressure torsion processing is conducted varying the strain using different numbers of anvil rotations. Optical microscopy (OM) and transmission electron microscopy (TEM), X-ray diffraction (XRD) are used to study the effect of processing regimes on consolidation and structural changes. Oxide layers, which are present on the surface of the initial amorphous ribbons, hinder the consolidation of ribbons into fully dense samples. Individual ribbons are clearly observed in the central region of the specimen deformed for one rotation, whereas the edge regions look more consolidated due to the strain gradient along the radius during processing. An increase in strain (by increasing the number of rotations) improves the homogeneity of the consolidated samples. The high-pressure torsion processing for ten rotations leads to the formation of dense samples with a minor concentration of small crack-like defects in the central region. Apparently, the oxides become refined and are distributed in the matrix predominantly in the form of fine particles. Possibly, there is also some dissolution of surface oxides with the formation of a solid solution of oxygen in the amorphous metallic matrix.

AB - High-pressure torsion is used to consolidate the melt-spun Cu50Zr50 amorphous ribbons. The high-pressure torsion processing is conducted varying the strain using different numbers of anvil rotations. Optical microscopy (OM) and transmission electron microscopy (TEM), X-ray diffraction (XRD) are used to study the effect of processing regimes on consolidation and structural changes. Oxide layers, which are present on the surface of the initial amorphous ribbons, hinder the consolidation of ribbons into fully dense samples. Individual ribbons are clearly observed in the central region of the specimen deformed for one rotation, whereas the edge regions look more consolidated due to the strain gradient along the radius during processing. An increase in strain (by increasing the number of rotations) improves the homogeneity of the consolidated samples. The high-pressure torsion processing for ten rotations leads to the formation of dense samples with a minor concentration of small crack-like defects in the central region. Apparently, the oxides become refined and are distributed in the matrix predominantly in the form of fine particles. Possibly, there is also some dissolution of surface oxides with the formation of a solid solution of oxygen in the amorphous metallic matrix.

KW - consolidation

KW - CuZr

KW - high-pressure torsion

KW - metallic glasses

KW - structures

KW - THERMAL-STABILITY

KW - CU-ZR

KW - FORMING ABILITY

KW - MECHANICAL-PROPERTIES

KW - PHASE

KW - MAGNETIC-PROPERTIES

KW - ALLOY

KW - BULK METALLIC-GLASS

UR - http://www.scopus.com/inward/record.url?scp=85073772813&partnerID=8YFLogxK

U2 - 10.1002/adem.201900694

DO - 10.1002/adem.201900694

M3 - Article

AN - SCOPUS:85073772813

JO - Advanced Engineering Materials

JF - Advanced Engineering Materials

SN - 1438-1656

M1 - 1900694

ER -