Dispersion strengthening in Ni–Co–Cr–SiC coatings: Effects of particle-matrix adhesion and dislocation obstruction revealed by multiscale modeling
This study aims to develop a high-hardness, wear-resistant Ni–Co–Cr–SiC composite coating to address increasingly stringent substrate protection requirements. The Ni–Co–Cr–SiC composite coating was fabricated via composite electrodeposition. The dispersion strengthening mechanism of SiC particles wa...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425017624 |
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| Summary: | This study aims to develop a high-hardness, wear-resistant Ni–Co–Cr–SiC composite coating to address increasingly stringent substrate protection requirements. The Ni–Co–Cr–SiC composite coating was fabricated via composite electrodeposition. The dispersion strengthening mechanism of SiC particles was elucidated through molecular dynamics simulations. SiC particles significantly enhanced coating performance, achieving a hardness of 878 HV and reducing the wear rate to 0.022 mm3/(N·m) (54 % lower than without addition). Microstructural characterization confirmed predominantly incoherent interfaces between SiC particles and the matrix, with the presence of semi-coherent structures (e.g., SiC(001)[101]//Ni–Co–Cr(111)[101]). Molecular dynamics calculations revealed that the work of separation for SiC-matrix interfaces (5.296–14.842 J/m2) significantly exceeds that of Ni–Co–Cr grain boundaries (3.095–3.380 J/m2). Tensile strength follows a power-law relationship with SiC volume fraction. Plasticity exhibits a sharp decline when the SiC volume fraction exceeds 3.5 %. Analysis of dislocation and stacking fault evolution demonstrates that particles promote dislocation nucleation and the formation of immobile dislocations. The hindering effect on dislocation glide is primarily governed by the dislocation necking distance (influenced by particle size), with an optimal particle spacing of 3.57 times the particle size. Particles inhibit deformation by pinning grain boundaries. This work provides theoretical support at the atomic level for the design of high-strength, wear-resistant coatings. |
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| ISSN: | 2238-7854 |