Mechanical, Physical and Structural Investigation of Severe Plastically Deformed CuZr-Based Metallic Glasses
Research output: Thesis › Master's Thesis
Standard
2019.
Research output: Thesis › Master's Thesis
Harvard
APA
Vancouver
Author
Bibtex - Download
}
RIS (suitable for import to EndNote) - Download
TY - THES
T1 - Mechanical, Physical and Structural Investigation of Severe Plastically Deformed CuZr-Based Metallic Glasses
AU - Rezvan, Amir
N1 - no embargo
PY - 2019
Y1 - 2019
N2 - This study shows processing of CuZr-based bulk metallic glass (BMG) via severe plastic deformation (SPD) under extreme loading condition, and investigates the effects of SPD induced by high-pressure torsion (HPT) on microstructural, thermal and (thermo)mechanical properties of Cu46Zr46Al8 BMG. The influence of sub-Tg annealing and HPT treatment on the structure-property relationships of BMGs is assessed separately and alternately in reference to the as-cast state. High extent of applied shear strain during HPT generates free volume in the structure and has mechanical softening and structural rejuvenation effect against mechanical hardening and embrittlement of the glass induced by sub-Tg isothermal heat treatment (HT). Thermal properties, structural modifications, and surface morphology/compositional changes are investigated by differential scanning calorimetry, X-ray diffraction, and scanning/transmission electron microscopy, respectively. In general, this thesis aims for the enhancement of the intrinsic properties of CuZr-based BMGs via controlled nanocrystallization and their uniform distribution throughout the amorphous BMG matrix.
AB - This study shows processing of CuZr-based bulk metallic glass (BMG) via severe plastic deformation (SPD) under extreme loading condition, and investigates the effects of SPD induced by high-pressure torsion (HPT) on microstructural, thermal and (thermo)mechanical properties of Cu46Zr46Al8 BMG. The influence of sub-Tg annealing and HPT treatment on the structure-property relationships of BMGs is assessed separately and alternately in reference to the as-cast state. High extent of applied shear strain during HPT generates free volume in the structure and has mechanical softening and structural rejuvenation effect against mechanical hardening and embrittlement of the glass induced by sub-Tg isothermal heat treatment (HT). Thermal properties, structural modifications, and surface morphology/compositional changes are investigated by differential scanning calorimetry, X-ray diffraction, and scanning/transmission electron microscopy, respectively. In general, this thesis aims for the enhancement of the intrinsic properties of CuZr-based BMGs via controlled nanocrystallization and their uniform distribution throughout the amorphous BMG matrix.
KW - Metallische Gläser
KW - Hochdruck-Torsion
KW - Verformung
KW - Wärmebehandlung
KW - Mechanische Eigenschaften
KW - Bulk metallic glasses
KW - High-pressure torsion
KW - Deformation
KW - Heat treatment
KW - Mechanical properties
M3 - Master's Thesis
ER -
