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X-Ray Photon Correlation Spectroscopy Revealing the Change of Relaxation Dynamics of a Severely Deformed Pd-Based Bulk Metallic Glass

37 Pages Posted: 6 May 2020 Publication Status: Accepted

See all articles by Hongbo Zhou

Hongbo Zhou

University of Muenster - Institute of Materials Physics

Sven Hilke

University of Muenster - Institute of Materials Physics

Eloi Pineda

Universitat Politècnica de Catalunya (UPC Barcelona Tech) - Institute of Energy Technologies

Martin Peterlechner

University of Muenster - Institute of Materials Physics

Yuriy Chushkin

European Synchrotron Radiation Facility

Sankaran Shanmugam

IIT Madras - Department of Metallurgical and Materials Engineering

Gerhard Wilde

Universitat Münster - Institut für Materialphysik

Abstract

The influence of severe plastic deformation on the relaxation dynamics of a Pd40Ni40P20 (at.%) bulk metallic glass was investigated on the atomic length scale by X-ray photon correlation spectroscopy and fluctuation electron microscopy. At a series of isothermal temperatures adjusted by step heating below the glass transition, the relaxation times were obtained by X-ray photon correlation spectroscopy and the corresponding activation energies were evaluated. It was found that the relaxation dynamics was accelerated by about a half order of magnitude after plastic deformation by high-pressure torsion processing, which indicates that effective rejuvenation has occurred. At relatively low temperatures the relaxation process was stress-dominated and deformation could improve the atomic mobility without changing the energy barrier. At higher temperatures, a second regime of relaxation times occurred. It is concluded that with increasing temperature, a crossover from a stress-dominated to a diffusion-dominated relaxation process occurs. Moreover, the medium range order was measured using variable resolution fluctuation electron microscopy indicating that deformation-induced changes in topology are responsible for the rejuvenation and the accelerated dynamics.

Keywords: Bulk metallic glass, High-pressure torsion, X-ray photon correlation spectroscopy, Relaxation dynamics, Fluctuation electron microscopy, Medium range order

Suggested Citation

Zhou, Hongbo and Hilke, Sven and Pineda, Eloi and Peterlechner, Martin and Chushkin, Yuriy and Shanmugam, Sankaran and Wilde, Gerhard, X-Ray Photon Correlation Spectroscopy Revealing the Change of Relaxation Dynamics of a Severely Deformed Pd-Based Bulk Metallic Glass. Available at SSRN: https://ssrn.com/abstract=3582189 or http://dx.doi.org/10.2139/ssrn.3582189

Hongbo Zhou (Contact Author)

University of Muenster - Institute of Materials Physics ( email )

Schlossplatz 2
Muenster, D-48149
Germany

Sven Hilke

University of Muenster - Institute of Materials Physics

Schlossplatz 2
Muenster, D-48149
Germany

Eloi Pineda

Universitat Politècnica de Catalunya (UPC Barcelona Tech) - Institute of Energy Technologies ( email )

Barcelona
Spain

Martin Peterlechner

University of Muenster - Institute of Materials Physics

Schlossplatz 2
Muenster, D-48149
Germany

Yuriy Chushkin

European Synchrotron Radiation Facility

71 avenue des Martyrs
CS40220
Grenoble, 38043
France

Sankaran Shanmugam

IIT Madras - Department of Metallurgical and Materials Engineering

Chennai
India

Gerhard Wilde

Universitat Münster - Institut für Materialphysik ( email )

Schlossplatz 2
Muenster, D-48149
Germany

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