In situ HEXRD study of a Ca61Al39 metallic glass

JOURNAL OF ALLOYS AND COMPOUNDS

卷:687

Article

Michalik, Stefan¹  Durisin, Juraj²  Balga, Dusan^3,4  Saksl, Karel^3,5  Durisin, Martin³  Drakopoulos, Michael¹ 

[1] Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

[2] Tech Univ Kosice, Fac Elect Engn & Informat, Dept Elect Technol, Pk Komenskeho 2, Kosice 04001, Slovakia

[3] Slovak Acad Sci, Inst Mat Res, Watsonova 47, Kosice 04001, Slovakia

[4] Tech Univ Kosice, Fac Met, Letna 9, Kosice 04200, Slovakia

[5] Safarik Univ, Fac Sci, Inst Phys, Pk Angelinum 9, Kosice 04154, Slovakia

关键词: Metallic glasses;    Atomic scale structure;    X-ray diffraction;    Synchrotron radiation;   

DOI  :  10.1016/j.jallcom.2016.06.094

来源: Elsevier

【 摘 要 】

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 Ca-Ca and Ca-Al pairs of the as-prepared structure were 3.70 angstrom and 3.24 angstrom, 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 relaxation, temperature T-r at 150 degrees 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 degrees C and 305 degrees C. Products of a devitrification process were identified to be alike a triclinic Ca8Al13 and monoclinic Ca13Al14 phase. (C) 2016 Diamond Light Source Ltd. Published by Elsevier B.V.

【 授权许可】

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