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In situ HEXRD study of a Ca61Al39 metallic glass

DOI: 10.1016/j.jallcom.2016.06.094 DOI Help

Authors: Stefan Michalik (Diamond Light Source) , Juraj Ďurišin (Technical University of Košice) , Dušan Balga (Institute of Materials Research, Slovak Academy of Sciences and Faculty of Metallurgy, Technical University of Košice) , Karel Saksl (Institute of Materials Research, Slovak Academy of Sciences and Institute of Physics, P.J. Šafárik University) , Martin Ďurišin (Institute of Materials Research, Slovak Academy of Sciences) , Michael Drakopoulos (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds , VOL 687 , PAGES 188 - 196

State: Published (Approved)
Published: December 2016
Diamond Proposal Number(s): 12163

Open Access Open Access

Abstract: High energy X-ray diffraction (HEXRD) was used to characterize the amorphous structure of the as-prepared binary Ca61Al39 (at.%) metallic glass and its evolution during thermal loading. The investigation was performed in both reciprocal and real space by means of the first diffuse peak (FDP) analysis and the reduced atomic pair distribution function (PDF) analysis, respectively. It was found that bond lengths of the atomic CaeCa and CaeAl pairs of the as-prepared structure were 3.70 Å and 3.24 Å, respectively. The coordination number of the first coordination shell was estimated to be 11.9. The analysis of the FDP behaviour during thermal treatment proposed the existence of the elaxation temperature Tr at 150 °C. Analysis of summations of all absolute differences between two consecutive intensity curves in the region of the FDP as a function of temperature revealed two crystallization temperatures at 280 °C and 305 °C. Products of a devitrification process were identified to be alike a triclinic Ca8Al13 and monoclinic Ca13Al14 phase.

Journal Keywords: metallic glass, atomic scale structure, X-ray diffraction, Synchrotron radiation

Subject Areas: Materials, Physics


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Documents:
1-s2.0-S0925838816318187-main.pdf