Comprehensive thermal analysis of a high stability Cu-Zr-Al bulk metallic glass subjected to high-pressure torsion

Author(s)

Adam Revesz, Talaye Arjmandabasi, Erhard Schafler, David J. Browne, Zsolt Kovacs

Abstract

Bulk metallic glass of Cu

₃₈Zr

₅₄Al

₈ nominal composition was synthesized by copper mold casting into 6 mm diameter rods. Disks of the as-cast glass were subjected to severe plastic deformation by high-pressure torsion for different number of revolutions. The microstructure and the thermal behavior of the as-cast, isothermally annealed and deformed glass have been investigated by X-ray diffraction and differential scanning calorimetry, respectively. Continuous heating experiments revealed a two-stage devitrification event with excellent glass forming parameters, such as glass transition (T

_g = 671 K), supercooled liquid region (∆T

_x = 80 K), reduced glass transition (T

_r = 0.57) and gamma parameter (γ = 0.41). Power law crystal growth during diffusion-controlled homogeneous nucleation was observed for isothermal annealings. Glassy state was preserved almost in the entire sample volume of the as-cast alloy during the high-pressure torsion process, corresponding to the extreme stability of the Cu

₃₈Zr

₅₄Al

₈ alloy against deformation-induced devitrification. This is in accordance with the transition of the reversible specific heat from the glassy to supercooled liquid state measured by modulated calorimetry. It was also concluded that glassy structure is more ordered in the severely deformed state.

Organisation(s)

Dynamics of Condensed Systems

External organisation(s)

Eötvös Loránd University Budapest, University College Dublin

Journal

Journal of Thermal Analysis and Calorimetry

Volume

148

Pages

2323–2334

No. of pages

12

ISSN

1388-6150

DOI

https://doi.org/10.1007/s10973-022-11875-7

Publication date

01-2023

Peer reviewed

Yes

Austrian Fields of Science 2012

103015 Condensed matter

Keywords

ASJC Scopus subject areas

Condensed Matter Physics, Physical and Theoretical Chemistry

Portal url

https://ucrisportal.univie.ac.at/en/publications/comprehensive-thermal-analysis-of-a-high-stability-cuzral-bulk-metallic-glass-subjected-to-highpressure-torsion(aa58755d-1ee9-4e9c-aba4-fb80c7ae62a6).html