Vitrification and devitrification processes in metallic glasses

Journal of Alloys and Compounds, Volume 586, Supplement 1,  Pages S2-S8. (2014)

D.V. Louzguine-Luzgin.

WPI Advanced Institute for Materials Research, Tohoku University, Aoba-Ku, Sendai 980-8577, Japan

 

Abstract

The phenomenon of vitrification on cooling, also called the glass-transition still remains not fully understood. Recent studies by different techniques were performed in order to shed light on this and on the converse phenomenon of devitrification. Devitrification may either lead to the formation of a supercooled liquid, a crystal(s) or a quasicrystal(s). The present paper is a review of recent findings on the processes of vitrification and devitrification in metallic glasses.

 

 

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Additional Information

 The phenomenon of vitrification on cooling, also called the glass-transition still remains not fully understood. Recent studies by different techniques were performed in order to shed light on this and on the converse phenomenon of devitrification. Devitrification may either lead to the formation of a supercooled liquid, a crystal(s) or a quasicrystal(s). The present paper is a review of recent findings on the processes of vitrification and devitrification in metallic glasses. We also review and emphasize our experiments indicating that the structural changes in the supercooled molten alloy affect its temperature dependence of the viscosity. The analysis of the atomic and electronic structure of a Pd-Cu-Ni-P alloy in the liquid and glassy states reveals rapid formation of chemical bonds with p-d hybridization between P and metal atoms (especially with Cu and Ni) due to charge transfer from a metal to phosphorous in the supercooled liquid temperature range close to the glass-transition region [see also D. V. Louzguine-Luzgin et al., Journal of Applied Physics 110, 043519 (2011)]. It is reflected in the intensification of the low-distance peak (P1) in the first maximum of the radial distribution function consisting of two peaks (P1 and P2). This process is responsible for the formation of covalently bonded Ni,Cu–P clusters facilitating a chemical short-range formation towards the glassy state.

 

Vitrification and devitrification processes in metallic glasses

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