Abstract
The effect of annealing temperature on the structure and mechanical properties of Ti41Zr39Ni20 coatings was examined. Coatings were deposited on stainless-steel substrates via magnetron sputtering and then annealed in a vacuum under temperatures from 200 to 850 °C. Evaluation of structure and mechanical properties under annealing was performed using cross-sectional transmission electron microscopy, X-ray diffraction analysis, and ultra-nano indentation. Further, mechanical durability was assessed by reciprocating sliding tests. The relationships between the mechanical properties and structural-phase characteristics of the coatings were established. Results suggested that the mechanical properties of the 2/1 approximant phase were better than those of the quasicrystal phase, probably due to the peculiarity of the atomic-crystal structure of the 2/1 approximant phase. In addition, the formation of layered structure caused by non-uniform phase transitions was observed for coatings annealed at 600 °C. The nanocrystalline structure of the top layer and high concentration of the 2/1 approximant phase resulted in the highest values of hardness (25 GPa) and hardness/elasticity ratio (0.14).
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