Abstract
In this paper, the features of the strength, fractures, and tribological behavior of metal-matrix composites based on the FeGr1 material are discussed. To improve the material properties, a mixture of SiC, Al2O3 and C nanoparticulates have been added to an iron-based matrix. The simplex lattice design method and hardness, compression, and bending tests were used to determine the mechanical properties. Scanning electron microscopy was applied for fracture features analysis. Different fracture types, mainly trans-crystalline quasi-brittle and brittle fracture or inter-granular fracture and microcracks were registered for the composites tested. Depending on the type and amount of ceramic additives, significant changes in strength, as well as in the fracture features of the metal-matrix composites (MMCs), were observed. Based on tribological tests, changes in the momentary coefficients of friction, temperature of the friction surface, and wear rate of the composites with nanoparticulates were described. An analysis of the worn surface morphology revealed changes in the wear process depending on the MMC composition. It was shown that the use of hybrid mixed additives based on hard ceramic nanoparticulates improved both strength and tribological properties of composites.
Highlights
Composites are important in the development of many industries, transport, engineering, or military technology
Composites based on the AZ31 magnesium alloy with Al2 O3 and SiC additives were considered by Karthick et al in [18]
Al-based composite with hybrid reinforcing by alumina and silicon carbide particulates. This provided an improvement in hardness and wear rate, and the efficiency of SiC was higher compared to Al2 O3
Summary
Composites are important in the development of many industries, transport, engineering, or military technology. Composites based on the AZ31 magnesium alloy with Al2 O3 and SiC additives were considered by Karthick et al in [18] Their density and microhardness increased compared to the starting material due to the silicon carbide presence. Al-based composite with hybrid reinforcing by alumina and silicon carbide particulates This provided an improvement in hardness and wear rate, and the efficiency of SiC was higher compared to Al2 O3. Summarizing the above, it can be claimed that the use of hybrid additives and nanoparticulates can significantly improve the properties of the MMCs. there is practically no information on the effectiveness of using hard ceramic nanoparticulates, and first, metal oxides and carbides, such as. The effect of Al2 O3 , SiC, and C nanoadditives and their mixtures on the microstructure, strength, fracture features, and tribological behavior of iron-based sintered materials is described
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