Open AccessNano-mechanical testing of Al-Nb metal matrix composites consolidated by high pressure torsion after annealing
Author(s) -
R. R. Mulyukov,
К. С. Назаров,
R. U. Shayakhmetov,
Г. Ф. Корзникова,
Elena A. Korznikova
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1008/1/012002
Subject(s) - materials science , intermetallic , annealing (glass) , composite material , composite number , severe plastic deformation , torsion (gastropod) , modulus , nanoindentation , grain size , medicine , surgery , alloy
Among different approaches for obtaining composite structures, one can distinguish the approach of severe plastic deformation that allows obtaining bulk structures from strongly dissimilar metals. The application of large strains is usually associated with grain refinement and, in some cases, with the formation of intermetallic phases, both factors contributing to the strength characteristics of the material. This work presents an investigation of nano-mechanical properties of an Al-Nb composite obtained by high pressure torsion and post deformational annealing. Measurements show that with an increase in the distance from the centre to the edge of the sample, the nanohardness increases from 2.4 to 3 GPa. Young’s modulus varies in the range from 182 to 197 GPa, which indicates the non-homogeneity of the composite sample. The Young’s modulus of the composite after high pressure torsion was found to be higher than that of pristine Al and Nb, which is probably due to the formation of the intermetallic Al 3 Nb phase, having an increased Young’s modulus according to ab-initio calculations.