Date of Award

2015

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

First Advisor

Reza Riahi

Second Advisor

Afsaneh Edrisy

Keywords

AlTiN, CrN, interface, material transfer, Ti-6Al-4V, TiN

Rights

CC-BY-NC-ND

Abstract

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.

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