Tribological Behavior of Annealed Ni-xFe-yCo Alloys: Effect of Co and Fe Additions

Abstract

The influence of annealing on the microstructure, mechanical and sliding wear characteristics of Ni-based alloys produced by spark plasma sintering (SPS) was investigated. As-sintered alloys had a lamellar-like microstructure consisting of (γ')-FeNi3 and γ-(NiFe) phases, with the γ' precipitates interconnected by narrow channels of γ phases at the interfaces. Lower Co contents (i.e. 30, 35 wt%) led to the formations of poorly bonded coarse γ precipitate islands. Annealed Ni-5Fe-45Co alloy exhibited the most excellent wear performance with the lowest coefficients of friction (0.142±0.05) and wear rate (0.3±0.02×10−4 mm3/Nm). Annealing resulted in alloys with good strength-ductility combinations due to appreciable γ' precipitation enhancement.

Evaluation of adhesion strength and tribological characteristics of Ni-Co-BN nano-coating developed by magnetron sputtering

“…Various deposition methods, including magnetron sputtering, physical vapour deposition, thermal spraying plasma aided chemical vapour deposition, thermal spraying, and pulse laser deposition, can be used to apply solid lubricant as a coating (PLD) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Superalloys based on nickel offer favourable high-temperature characteristics, making them an attractive choice for tribological applications.To achieve a balance of good mechanical strength, corrosion resistance, and surface wear, these alloys are typically manufactured with additions of iron (Fe), cobalt (Co), aluminium (Al), and tantalum (Ta) [35] Experimental Procedure…”