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Shear Band-Induced Internal Surface Structures in a Vitreloy Bulk Metallic Glass Deformed by High-Pressure Torsion
Zsolt Kovács1, Talaye Arjmandabasi1, Gábor Erdei2
1Department of Materials Physics, Institute of Physics, Eötvös Loránd University, Pázmány Péter St. 1/a, H-1117 Budapest, Hungary.
Abstract:
In the present investigation, high stability Vitreloy Zr44Ti11Cu10Ni10Be25 bulk metallic glass has been subjected to severe shear deformation by high-pressure torsion for 0.1 revolutions under an applied pressure of 4 and 8 GPa. The fully glassy nature of the as-cast glass has been confirmed by X-ray powder diffraction and differential scanning calorimetry. Deformation-induced surface features on an internal plane of the deformed disk-shaped specimens were studied in detail at the macroscopic level by optical reconstruction method and at microscopic scales by white-light optical profilometry. Shear and compressive strain components were measured based on surface changes and it was determined that compressive strain gradient with 0.2-0.4 strain change builds up toward the disk edge, while only part of the nominal shear deformation occurs in the disk interior. The effect of strain localization in the Vitreloy bulk metallic glasses has been quantified by a surface distortion model based on simple shear. The model was then validated experimentally by the reconstructed z-profiles.
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