Date of Award
Mechanical, Automotive, and Materials Engineering
AlTiN, CrN, interface, material transfer, Ti-6Al-4V, TiN
The adhesion mechanisms of titanium alloy Ti-6Al-4V to AISI 52100 steel and AlTiN, TiN and CrN nitride coating were studied. It was found that the transferred Ti-6Al-4V had a layered amorphous structure in which nanocrystalline and polycrystalline oxides were embedded. High resolution TEM (HRTEM), electron diffraction, and fast Fourier transform (FFT) investigations revealed the presence of nanocrystalline TiO (C2/m) at the steel/transfer layer and AlTiN/transfer layer interface. However only α-titanium (P63/mmc) was detected at the TiN/transfer layer interface and CrN/transfer layer. This observation explains that the coefficient of friction between TiN and Ti-6Al-4V as well as CrN and Ti-6Al-4V reached the threshold value within shorter distance. The different adhesion behavior of Ti-6Al-4V to different counterface materials can be related to low misfit between α-titanium and TiN and CrN crystals.
Jin, Liang, "Adhesion mechanisms of Ti-6Al-4V to PVD coatings" (2015). Electronic Theses and Dissertations. 5705.