Abstract
Structural transformations and tribological properties of a Ti49.4Ni50.6 alloy have been investigated at the liquid-nitrogen temperature. It has been shown that the alloy under study possesses the resistance to abrasive and adhesive wear smaller by a factor of 1.4–1.7 and the friction coefficient that is (to 1.7 times) higher, as compared to the austenitic steel 12Kh18N9. The only moderate tribological properties of the titanium nickelide are caused by an enhanced brittleness of this material under the conditions of friction-initiated severe plastic deformation. The enhanced low-temperature brittleness of the martensitic structure is seemingly explained by a low symmetry of the crystal lattice of the B19’ martensite, an atomically ordered state of this phase, and the formation of a brittle amorphous phase in the layer several microns thick near the friction surface of the alloy. The appearance of a continuous amorphous layer at the friction surface of the titanium nickelide is favored by the presence of the martensitic structure in the alloy, its stability under the friction conditions with respect to the reverse B19′ → B2 transformation, and a high intensity of the deformation processes occurring in the zone of friction contact. Below the amorphous layer, a mixed amorphous-crystal-line structure is located. The nanocrystallites are textured and range in size from a few to tens of nanometers. The formation of crystallites of the B2 phase in the amorphized layer appears to occur at the stage of warming of the alloy samples to room temperature. A similar amorphous-nanocrystalline structure arises near the abrasive-wear surface of the Ti49.4Ni50.6 alloy. It has been shown that the presence of a submicrocrystalline structure in the initial Ti49.4Ni50.6 alloy exerts no significant effect on the tribological properties and the character of structural transformations induced in the alloy by the frictional action.
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Original Russian Text © L.G. Korshunov, V.G. Pushin, N.L. Chernenko, V.V. Makarov, 2012, published in Fizika Metallov i Metallovedenie, 2012, Vol. 113, No. 1, pp. 87–97.
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Korshunov, L.G., Pushin, V.G., Chernenko, N.L. et al. Structural transformations and wear resistance of titanium nickelide under conditions of sliding friction at a cryogenic (−196°C) temperature. Phys. Metals Metallogr. 113, 82–92 (2012). https://doi.org/10.1134/S0031918X1201005X
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DOI: https://doi.org/10.1134/S0031918X1201005X