Toughening mechanism analysis of TiN/TiSiN coatings with modulation period gradient structure
Source abstract
Abstract
The service life of cutting tools is critical for machining parts in biomedical, aerospace and automotive applications. The service life of cutting tools is closely related to the hardness and toughness of their surface hard coatings. Cutting tools can fail prematurely during machining due to insufficient toughness of the surface hard coatings. In order to enhance the toughness of hard coatings, TiN/TiSiN multilayer coatings with modulation period gradient variations are designed, and the toughening mechanism is analyzed in this work. The results demonstrate that the modulation period gradient structure can enhance the toughness of the coating while maintaining its high hardness. In addition, the cracks observed of the gradient coatings in the indentation experiments not only closely match the maximum principal stress concentration region of numerical simulations, but also the crack evolutions under different indentations are consistent with the stress evolution results of numerical simulations. Subsequently, the combined results from theoretical analysis, experiments, and numerical simulations indicate that the gradient structure I2 can reduce the maximum stress of TiN/TiSiN multilayer coatings by 22.4% under external loading. It also reduces the disparity between the maximum principal tensile and compressive stresses by 50%, thus inhibiting the cracking and enhancing the toughness of the TiN/TiSiN multilayer coating. This work may provide theoretical guidance for hard coating toughening design and preparation.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Metal and Thin Film Mechanics · Surface Treatment and Residual Stress · Boron and Carbon Nanomaterials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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