The current work presents the results of studding surface structure of the AK5M7 aluminum alloy hardened by the Electro Spark Alloying (ESA) technique with subsequent annealing. Analysis of crystallite size (CS) values, microdistortion of phase crystal lattices found on the surface, microhardness, and wear resistance allows concluding that, the degree of defectiveness of the surface structure plays a decisive role in its wear resistance.

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