Segregation Refinement of the Grain Structure of Aluminium and Its Alloys

Lutsenko, E.V.; Kreshchenko, V. A.; Rud’, M. D.; Sоbоl, O. V.; Glushchenko, M. A.; Зубков, А. И.

doi:10.15407/mfint.39.05.0607

Cited by 2 publications

(1 citation statement)

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“…For example, alloying of aluminum films, foils, or coatings obtained by physical vapor deposition in vacuum (PVD-technology) with iron allows reducing the grain size of these materials to nanoscale dimension, increasing their strength properties and recrystallization temperature. As a result, these objects are widely used in the aviation and aerospace industries, primarily in parts exposed to thermal effects [1][2][3]. At the same time, the physical mechanisms of the modifying effect of iron on aluminum are currently controversial and insufficiently studied.…”

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Positive Deviation of the Hall-Petch Relationship for Aluminum Condensates Alloyed with Iron

Lutsenko

Зубков

Zhadko

et al. 2021

EEJP

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The structure and strength properties of vacuum aluminum condensates alloyed with iron in the concentration range of 0.1 – 3.2 at. % is studied in the paper. It is shown that up to a concentration of about 2 at. % Fe, the grain size decreases, the strength properties increase and the lattice parameter values of these objects remain unchanged. It is found that at an iron concentration of up to ~ 2 at. % its atoms are concentrated in the grain boundaries of the aluminum matrix metal in the form of grain boundary segregation. At high concentrations, the structure of condensates is a supersaturated solution of iron in the FCC crystal lattice of aluminum. Highly dispersed Al13Fe4 intermetallic compounds are present at the grain boundaries and within the volume of grains. It has been found that the Hall-Petch coefficient for one-component aluminum condensates is 0.04 MPa·m1/2, which is typical for this metal. For Al-Fe condensates, a positive deviation from the Hall-Petch dependence is observed and the coefficient k increases to 0.4 MPa·m1/2 for a structure with grain boundary segregations and to 0.14 MPa·m1/2 for condensates containing intermetallic compounds. The obtained experimental results are explained by the different structural-phase state of the grain boundaries of the aluminum matrix.

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confidence: 99%