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Texture evolution in biocompatible Mg-Y-Re alloy after friction stir processing

Wednesday (06.11.2019)
09:35 - 09:55
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Their advantageous properties, such as low density, good castability and machinability, favourable specific strength, and superior thermal and electrical conductivity, make magnesium-based alloys perspective solutions for demanding applications, such as lightweight structures, transportation equipment, and aircraft or jet engines. Nevertheless, given by their favourable biocompatibility, selected alloys are also useful for certain bio-applications and biodegradable implant components. The presented study deals with the investigation of biocompatible WE 43 magnesium-based alloy processed via friction stir processing (FSP) at three different rotational speeds of 400 RPM, 800 RPM and 1200 RPM. After processing, the structures were examined via scanning electron microscopy, and the mechanical properties were acquired via tensile testing. The electron backscatter diffraction (EBSD) observations primarily focused on characterizations of grain sizes and grain boundaries in combination with residual stress detection and determination of recrystallized fraction. The results showed that processing at 400 RPM and 1 200 RPM lead to substantial recrystallization and grain refinement, the fractions of low angle grain boundaries within these samples were 22 % and 11 %, respectively, while for the 800 RPM sample exhibiting secondary recrystallization it was almost 40 %. The grains were also the finest in the 1 200 RPM sample (average grain diameter of 1.9 µm). The processed structures exhibited a slight tendency to form the {10-10} <0001> preferential fibre texture (especially the 800 RPM sample. Tensile testing showed the FSP to have positive influence on the ultimate tensile stress, as well as ductility, of all the samples; the mechanical properties improved with increasing FSP rate.

Dr. Lenka Kuncicka
Czech Academy of Sciences
Additional Authors:
  • Dr. Petr Král
    Czech Academy of Sciences
  • Prof. Radim Kocich
    VSB - Technical University of Ostrava
  • Dr. Jiří Dvořák
    Czech Academy of Sciences