Effect of Surface Layer Structural-Phase Modification on Tribological and Strength Properties of a TiC-(Ni-Cr) Metal Ceramic Alloy

doi:10.1007/s40195-017-0648-6

Abstract

Abstract:

This paper reports TiC-(Ni-Cr) metal ceramic alloy (ratio of components 50:50) with nanoscaled components formed in the surface layer and smoothly transformed into the initial inner structure throughout the material under pulsed electron irradiation of the alloy surface. Principal changes in the surface layer are ascribed to the formation of gradient structure leading to the increase in wear resistance of the surface layer, drop of friction coefficient and improvement of specimen bending resistance when stressing on the irradiated surface side. The above changes of tribological and strength properties in the surface layer under pulsed electron irradiation become more apparent with increasing atomic mass of a plasma-forming inert gas.

Key words: Metal ceramic alloy, Particle-reinforced composite, Interphase boundaries, Tribological behavior, Bending strength, Electron beam treatment

Bao-Hai Yu, V. E. Ovcharenko, K. V. Ivanov, A. A. Mokhovikov, Yan-Hui Zhao. Effect of Surface Layer Structural-Phase Modification on Tribological and Strength Properties of a TiC-(Ni-Cr) Metal Ceramic Alloy[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(5): 547-551.

Figures/Tables 7

Table 1 Pulsed electron irradiation in argon, krypton and xenon plasmas differing in atomic weights and ionizing energy

Plasma-forming gas	Atomic weight (g/mol)	Ionizing energy (kJ/mol)
Ar	39.948	1519.6
Kr	83.798	1350.0
Xe	131.29	1170.0

Fig. 1 Diagram of specimen preparation for TEM analysis microstructure of the surface layer (cross section)

Fig. 2 TEM image of TiC-(Ni-Cr) metal ceramic alloy microstructure in the initial state

Fig. 3 General view of TiC-(Ni-Cr) metal ceramic alloy surface layer microstructure (irradiation in argon plasma at electron beam energy density 60 J/cm2, irradiation pulse duration 150 μs, 15 irradiation pulses (TEM)): a the structure of column-formed carbide particles as a result of high-speed crystallization of top surface layer melt; b metal ceramics with nanoscaled carbide particles; c the bottom sublayer with submicro- and microscaled carbide particles; d transition area to the initial structure of metal ceramic alloy

Fig. 4 Thickness of the modified layer under pulsed electron irradiation of its surface in argon, krypton and xenon plasmas vs irradiation pulse duration at electron beam energy densities 40 and 60 J/cm2 (15 irradiation pulses)

Fig. 5 Wear rate cut a by the diamond counterbody in the surface layer of metal ceramic alloy and value of friction coefficient b on the surface of alloy specimens after pulsed electron irradiation in argon, krypton and xenon plasmas vs electron beam energy density at pulse duration 150 μs (15 irradiation pulses)

Fig. 6 Ultimate strength under bending when loading on the irradiated surface after pulsed electron irradiation in argon a, krypton b, xenon c versus electron irradiation pulse duration for electron beam energy density 40 and 60 J/cm2 (15 irradiation pulses)

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