This article contains the study of correlation between the microstructure, mechanical properties and mechanisms of elastoplastic deformation of Ni-Fe coatings that were grown in five electrodeposition modes and had fundamentally different microstructures. A nonlinear change in hardness was detected using nanoindentation. Explanation of the abnormal change in hardness was found in the nature of the relaxation method of elastoplastic energy under load. It is shown that the deformation of coatings with a grain size of 100 nm or more occurs due to dislocation slip. A decrease in grain size leads to the predominance of deformation due to rotations and sliding of grains, as well as surface and grain boundary diffusion. The effect of deformation mechanisms on the nanoscale hardness of Ni-Fe coatings was established. Full hardening of the coatings (both in the bulk and on the surface) was achieved while maintaining the balance of three mechanisms of elastoplastic deformation in the sample. Unique coatings consisting of two fractions of grains (70% of nano-grains and 30% of their agglomerates) demonstrate high crack resistance and full-depth hardening up to H = 7.4 GPa due to the release of deformation energy for amorphization and agglomeration of nanograins.

本文包含对以五种电沉积模式生长并具有根本不同微观结构的 Ni-Fe 涂层的微观结构、机械性能和弹塑性变形机制之间的相关性的研究。使用纳米压痕检测硬度的非线性变化。硬度异常变化的解释是在载荷作用下弹塑性能松弛法的性质中找到的。结果表明，由于位错滑移，晶粒尺寸为 100 nm 或更大的涂层发生变形。由于晶粒的旋转和滑动以及表面和晶界扩散，晶粒尺寸的减小导致变形占优势。确定了变形机制对 Ni-Fe 涂层纳米级硬度的影响。在保持样品中三种弹塑性变形机制的平衡的同时，实现了涂层的完全硬化（在本体和表面上）。由两种颗粒组成的独特涂层（70% 的纳米颗粒和 30% 的附聚物）表现出高抗裂性和全深度硬化 由于纳米颗粒非晶化和团聚释放变形能，H = 7.4 GPa。