TY - JOUR

T1 - Evolution of structure, residual stress, thermal stability and wear resistance of nanocrystalline multilayered Al0.7Cr0.3N-Al0.67Ti0.33N coatings

AU - Spor, Stefan

AU - Jäger, Nikolaus

AU - Meindlhumer, Michael

AU - Hruby, Hynek

AU - Burghammer, M.

AU - Nahif, F.

AU - Mitterer, Christian

AU - Keckes, Jozef

AU - Daniel, Rostislav

PY - 2021

Y1 - 2021

N2 - The fundamental understanding of the relation between the architecture and the development of structure and residual stress in multilayer coatings is a challenging task. In this work, cross-sectional X-ray nanodiffraction with a spatial resolution of 50 nm, performed at the cross-section of a Al0.7Cr0.3N/Al0.67Ti0.33N multilayer coating was used to investigate its depth gradients of the phase composition and residual stress. It could be demonstrated that the cubic structure can be stabilized in a substrate bias range between −100 and −200 V developing stress values above −5 GPa. Below −100 V and above −200 V a dual phase microstructure developed with reduced stress values compared to the pure cubic regime. Based on the results of the cross-sectional X-ray nanodiffraction investigation, five multilayer architectures, differing in the sublayer thickness, interface design and microstructure were developed to test the wear resistance by ball-on-disc experiments at temperatures up to 700 °C. It could be demonstrated that a sublayer thickness between 70 and 100 nm has been proven to be an ideal thickness for such an Al0.7Cr0.3N/Al0.67Ti0.33N multilayer to decrease the wear rate by a factor of 10 at 600 °C compared to their monolithic counterparts.

AB - The fundamental understanding of the relation between the architecture and the development of structure and residual stress in multilayer coatings is a challenging task. In this work, cross-sectional X-ray nanodiffraction with a spatial resolution of 50 nm, performed at the cross-section of a Al0.7Cr0.3N/Al0.67Ti0.33N multilayer coating was used to investigate its depth gradients of the phase composition and residual stress. It could be demonstrated that the cubic structure can be stabilized in a substrate bias range between −100 and −200 V developing stress values above −5 GPa. Below −100 V and above −200 V a dual phase microstructure developed with reduced stress values compared to the pure cubic regime. Based on the results of the cross-sectional X-ray nanodiffraction investigation, five multilayer architectures, differing in the sublayer thickness, interface design and microstructure were developed to test the wear resistance by ball-on-disc experiments at temperatures up to 700 °C. It could be demonstrated that a sublayer thickness between 70 and 100 nm has been proven to be an ideal thickness for such an Al0.7Cr0.3N/Al0.67Ti0.33N multilayer to decrease the wear rate by a factor of 10 at 600 °C compared to their monolithic counterparts.

U2 - 10.1016/j.surfcoat.2021.127712

DO - 10.1016/j.surfcoat.2021.127712

M3 - Artikel

VL - 425.2021

JO - Surface & coatings technology

JF - Surface & coatings technology

SN - 0257-8972

IS - 15 November

M1 - 127712

ER -