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Atomic structure of Ca–Mg biodegradable metallic glass

DOI: 10.1016/j.jallcom.2019.06.120 DOI Help

Authors: K. Saksl (Institut of Materials Research, Slovak Academy of Sciences; Pavol Jozef Šafárik University in Košice) , Z. Molčanová (Institut of Materials Research, Slovak Academy of Sciences) , J. Durisin (Technical University of Kosice) , S. Michalik (Diamond Light Source) , L. Temleitner (Institute for Solid State Physics and Optics, Hungarian Academy of Sciences) , B. Balloková (Institut of Materials Research, Slovak Academy of Sciences) , V. Girman (Pavol Jozef Šafárik University in Košice) , Y. Katuna (Pavol Jozef Šafárik University in Košice) , M. Sulikova (Pavol Jozef Šafárik University in Košice) , K. Sulova (Institut of Materials Research, Slovak Academy of Sciences; Technical University of Košice) , M. Fejercak (Institut of Materials Research, Slovak Academy of Sciences; Jozef Šafárik University in Košice) , M. Lisnichuk (Pavol Jozef Šafárik University in Košice) , A. Lachová (Pavol Jozef Šafárik University in Košice) , L. Kapuscinský (Institut of Materials Research, Slovak Academy of Sciences)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: June 2019

Abstract: Very low density eutectic Ca72Mg28 at.% alloy is a precursor of complex biodegradable alloys with potential use as bioresorbable alloy for orthopaedic applications. The structure of the amorphous alloy was investigated by using X-ray, neutron diffraction and reverse Monte Carlo (RMC) modelling. The RMC configuration was decomposed into polyhedral holes whose faces are all triangles consisting of chemical bonds. Free volumes in the respective polyhedral holes were evaluated with reference to the packing efficiency of crystalline CaMg2 HCP phase. The tetrahedral holes, accounting for about 55% of the whole space, are regarded as densely packed units because the average packing efficiency of them is approximately equal to that of the corresponding crystal phase. At the same time, various types of polyhedral holes which have a certain free volume have been observed, and some of them are connected with each other. The densely packed coordination polyhedra consisting only of tetrahedral holes tend to be clustered.

Journal Keywords: Metallic glass; Amorphous; Calcium-magnesium; Atomic structure

Subject Areas: Materials


Instruments:

Other Facilities: Deutsches Elektronen-Synchrotron (DESY)