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Deformation Mechanisms of NiP/Ni Composite Coatings on Ductile Substrates

机译：延性基材NIP / Ni复合涂层的变形机制

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NiP/Ni composite coatings with different thicknesses were prepared on coarse-grained Ni substrates by electrodeposition. The tensile tests show that compared with the substrate, the toughness and strength of the samples with multilayer composite coatings are greatly improved. The uniform elongation is increased from 24% to 43%, and the yield strength is increased from 108 to 172 MPa. In the deformation process, the geometrically necessary dislocations accumulate, resulting in long-range back stress, leading to strain hardening, showing synergistic strength and ductility. The mechanical properties of composite coatings are strongly affected by the layer thickness. Molecular dynamics studies show that there is a more uniform distribution of the shear strain in thinner coatings, and the propagation of shear transformation zones (STZs) is restrained, preventing the formation of a large shear band. With the decrease of thickness, the deformation of the NiP layer changes from shear fracture to the coexistence of uniform deformation and shear deformation. The interface resistance of the multilayer structure increases the resistance of crack propagation and alleviates the effects of NiP layer cracking on substrate cracking. Multilayer amorphous/crystalline coatings therefore may increase the toughness of the Ni substrate.
机译：通过电沉积在粗粒性Ni底物上制备具有不同厚度的NIP / Ni复合涂层。拉伸试验表明，与基材相比，具有多层复合涂层的样品的韧性和强度大大提高。均匀伸长率从24％增加到43％，屈服强度从108增加到172MPa。在变形过程中，几何必要的脱位累积，导致远程背部应力，导致应变硬化，显示出协同强度和延展性。复合涂层的机械性能受到层厚度的强烈影响。分子动力学研究表明，在较薄的涂层中存在更均匀的剪切应变的分布，并且抑制剪切变换区域（STZS）的传播，防止形成大的剪切带。随着厚度的降低，辊隙层的变形从剪切断裂变为均匀变形和剪切变形的共存。多层结构的界面电阻增加了裂纹传播的电阻，并减轻了夹下层裂纹对底物裂化的影响。因此，多层非晶/结晶涂层可以增加Ni衬底的韧性。

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