Indentation creep study on a Zr-based bulk metallic glass containing nano-quasicrystals

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 483; pp. 607 - 610
• Main Authors: Lendvai, J., Fátay, D., Gubicza, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2008; Elsevier
• Subjects: Bulk metallic glass; Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Indentation creep; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Quasicrystal; Viscosity; Viscosity; Indentation creep; Quasicrystal; Bulk metallic glass; Crystalline phase; Creep; Isothermal annealing; Crystallization; Nanoquasicrystal; Indentation; Glass transition; Metallic glasses; Activation energy; Zirconium alloys
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2006.12.172

The effect of crystallization on the creep behavior of a Zr-based bulk metallic glass (BMG) with the composition of Zr 44Ti 11Cu 10Ni 10Be 25 (at.%) was studied by indentation technique. The crystallization process was studied by isothermal annealing in a differential scanning calorimeter at three different temperatures above the glass transition temperature (677, 682 and 687 K). Two exothermic peaks are detected, the first one corresponds to the formation of a quasicrystalline phase. Indentation creep tests were carried out isothermally at the same three temperatures for studying the correlation between the amount of quasicrystalline phase and the creep behavior. A simple relationship between the viscosity and the crystalline phase fraction was found and the activation energy was found to decrease with the progress of crystallization.