Open AccessInfluence of equal-channel angular pressing on the functional characteristics of biodegradable Fe-based alloys
Author(s) -
O. V. Rybalchenko,
Natalia Anisimova,
M. V. Kiselevsky,
Georgy Rybalchenko,
Natalia Martynenko,
N. Yu. Tabachkova,
Н. Р. Бочвар,
И. В. Щетинин,
A. A. Tokar,
А. Г. Рааб,
С. В. Добаткин
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1688/1/012009
Subject(s) - materials science , microstructure , pressing , indentation hardness , ultimate tensile strength , severe plastic deformation , metallurgy , crystal twinning , austenite , scanning electron microscope , transmission electron microscopy , composite material , nanotechnology
In this work samples of Fe-Mn alloys were subjected to equal-channel angular pressing (ECAP) in order to study the effect of the resulting microstructure on the mechanical properties, biodegradation rate, and biocompatibility in vitro of the alloys. The microstructure of the alloys was studied by scanning and transmission electron microscopy, as well as by X-ray diffraction analysis. Mechanical properties were studied by microhardness and tensile tests. It is shown that as a result of deformation by the ECAP method, a predominantly austenitic ultrafine-grained (UFG) structure is formed, shear bands up to 600 nm thick and nanosized twins up to 40 nm thick were observed. The release of α-Mn particles in the ECAP process was revealed. Due to the structure refinement and twinning during ECAP, the strength characteristics of Fe-Mn alloys were significantly increased compared to the corresponding alloys in the initial annealed state. An increase in the propensity to biodegradation of UFG alloys with their satisfactory hemocompatibility was observed.