Date of Award

Winter 2013

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

First Advisor

Edrisy, Afsaneh

Keywords

Applied sciences, Ion nitriding, Titanium alloys

Rights

CC BY-NC-ND 4.0

Abstract

In this study, a low-temperature ion nitriding treatment has been developed with the aim of improving the sliding behaviour of Ti-10V-2Fe-3Al, without adverse effects on its strength and ductility. The optimized nitriding treatment was carried out at a temperature of 600°C for 8 hours in a pressure dilute nitriding atmosphere of 67 Pa and 2.9 vol.% N2. The microstructural analysis indicated that the ion nitriding treatment led to the formation of a 0.5 μm thick compound layer. The microhardness measurements revealed the formation of an approximately 35 μm thick nitrogen diffusion zone beneath the compound layer. The tensile test results showed improvements in the tensile and yield strengths of the alloy with a minor decrease in the elongation. The load bearing capacity and friction properties of the nitrided surfaces under sliding were investigated by microscratch tests. It was found that the coefficient of friction values were reduced and the surfaces exhibited an excellent load bearing capacity.

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