@article{Lutsenko_Zubkov_Zhadko_Zozulya_2021, title={Positive Deviation of the Hall-Petch Relationship for Aluminum Condensates Alloyed with Iron}, url={https://periodicals.karazin.ua/eejp/article/view/18051}, DOI={10.26565/2312-4334-2021-4-17}, abstractNote={<p>The structure and strength properties of vacuum aluminum condensates alloyed with iron in the concentration range of 0.1 – 3.2&nbsp;at.&nbsp;% 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&nbsp;~&nbsp;2&nbsp;at.&nbsp;% 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 Al<sub>13</sub>Fe<sub>4</sub> 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&nbsp;MPa·m<sup>1/2</sup>, which is typical for this metal. For Al-Fe condensates, a positive deviation from the Hall-Petch dependence is observed and the coefficient <em>k</em> increases to 0.4 MPa·m<sup>1/2 </sup>for a structure with grain boundary segregations and to 0.14&nbsp;MPa·m<sup>1/2</sup> 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.</p&gt;}, number={4}, journal={East European Journal of Physics}, author={Lutsenko, Evgeniy and Zubkov , Anatoly and Zhadko, Maria and Zozulya , Eduard}, year={2021}, month={Dec.}, pages={135-139} }