Mechanical response of Al-TiN nanolayered composites: 3D discrete dislocation dynamics analysis
Caizhi Zhou (Missouri S&T)
Discrete Dislocation Plasticity
Tue 4:20 - 5:40
RI Hall 108
In recent years, the mechanical behavior of metal–ceramic nanolayered composites has attracted much attention in materials science field. The scientific interest in these materials stems partly from the fact that their constituent phases present large differences in strength and elastic modulus. In Al–TiN nanolayered composites, Al layer exhibited ultra-high yield strength and extraordinarily high work-hardening rate, the value of which is about one forth or half of the Young’s modulus. In this study, 3-D discrete dislocation dynamics simulations are used to study mechanical response of Al–TiN nanolayered composites under compression. We compare the simulations results with micro-compression test results and analyze the influences of dislocation densities, boundary constrains and image forces on the observed extraordinarily high strain-hardening rates in the Al layers. We also discuss the role of interfacial dislocation structures on the mechanical response of Al–TiN nanolayered composites.