Abstract
While deposited thin film coatings can help enhance surface characteristics such as hardness and friction, their effective incorporation in product design is restricted by the limited understanding of their mechanical behavior. To address this, an approach combining micro-indentation and meso/micro-scale simulations was proposed. In this approach, micro-indentation testing was conducted on both the coating and the substrate. A meso-scale uniaxial compression finite element model was developed to obtain a material model of the coating. This material model was incorporated within an axisymmetric micro-scale model of the coating to simulate the indentation. The proposed approach was applied to a Ti/SiC metal matrix nanocomposite (MMNC) coating, with a 5% weight of SiC nanoparticles deposited over a Ti-6Al-4V substrate using selective laser melting (SLM). Micro-indentation testing was conducted on both the Ti/SiC MMNC coating and the Ti-6Al-4V substrate. The results of the meso-scale finite element indicated that the MMNC coating can be represented using a bi-linear elastic-plastic material model, which was incorporated within an axisymmetric micro-scale model. Comparison of the experimental and micro-scale model results indicated that the proposed approach was effective in capturing the post-indentation behavior of the Ti/SiC MMNC coating. This methodology can also be used for studying the response of composite coatings with different percentages of reinforcements.
Highlights
Dispersing nanoceramic particles into a metal matrix can enhance many performance aspects of the substrate, including strength, temperature stability, wear, fatigue resistance, and toughness [1,2,3,4,5]
To validate the material model parameters used in the developed axisymmetric micro-scale models, the average plastic indentation depth values of multiple elements immediately below the indenter were compared with the experimental results for both the
We identified the mechanical material model of a Ti/SiC metal matrix nanocomposite (MMNC) coating on a Ti-6Al-4V substrate using the proposed methodology
Summary
Dispersing nanoceramic particles into a metal matrix can enhance many performance aspects of the substrate, including strength, temperature stability, wear, fatigue resistance, and toughness [1,2,3,4,5]. These characteristics have led to the expanded use of nanoceramic particles in various structural, aerospace, automotive, and railway applications [6,7,8]. The three composite coatings had higher microhardness and better wear resistance than pure titanium substrate. Savalani et al [13] fabricated TiC-reinforced titanium matrix composite layers by laser cladding with 5, 10, 15, and 20 weight percentages of carbon-nanotubes
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