The effects of modulation period, modulation ratio, and deposition temperature on microstructure and mechanical properties of ZrB2/W multilayers

Abstract

Monolithic ZrB 2 , W coatings and ZrB 2 /W multilayers with different modulation periods and modulation ratios were synthesized by ion beam assisted deposition at room temperature and 400°C. X-ray diffraction (XRD), scanning electron microscopy (SEM), surface profiler, and nanoindention were employed to investigate the influences of the deposition temperature and the modulation period on the growth, textures, interface structure, and mechanical properties of the multilayers. The results indicated that the multilayer with modulation period of 13 nm synthesized at room temperature possessed a higher hardness of 23.8 GPa. Deposition temperature gave a significant contribution to mechanical property enhancement. The 400°C-deposition temperature led to a maximum hardness and elastic modulus value of 32.1 and 399.1 GPa for ZrB 2 /W multilayer with a modulation period of 6.7 nm. Its critical load increased to 42.8 mN and residual stress decreased to 0.7 GPa. A higher deposition temperature can cause an increase in interfacial atomic mixture and mobility of surface species, which induceds an increase in areal atomic density and dislocation pinning. These results as well as small nanoscale grain sizes should be related to hardness increase.ion beam assisted deposition, nanoscale multilayers, modulation period, modulation ratio, deposition temperature, hardness Citation:Liu M Y, Tan M, Liu G Q, et al. The effects of modulation period, modulation ratio, and deposition temperature on microstructure and mechanical properties of ZrB 2 /W multilayers.

Investigation of the Wear Resistance Properties of Cr/CrN Multilayer Coatings against Sand Erosion

“…Therefore, it is supposed that a deterioration of the mechanical properties of Cr0.25/CrN0.25 coating can be related to the 96 layers which are a part of the coating architecture. Moreover, residual stresses generally increase with the increase in modulation period [36]; therefore the presence of high residual stresses in the coating can be expected in this case. Stress measurements, planned for the near future, may provide clear statements on the effect of bimodal periods in the multilayer coatings.…”