Evaluation of internal stresses in single-, double- and multi-layered TiN and TiAlN thin films by synchrotron radiation

Abstract

Residual stresses in TiN and TiAIN films on steel substrate were investigated by ultra high X-rays of synchrotron radiation. The specimens prepared in this study were single-, double- and multi-layer TiN and TiAIN films deposited on high speed steel substrate by arc-ion plating. The minimum thickness available for the residual stress measurement was 0.8 μm by in-lab equipment whereas below 0.1 μm by synchrotron radiation. Extremely large compressive residual stresses were found in the films. Residual stresses in TiAIN films were more than twice larger than those in TiN films, resulting to reduce the average residual stress in the whole film system by making double- or multi-layer film construction comparing to that in the single TiAIN film.