A study on the dry uni-directional sliding behaviour of titanium aluminides
Journal
Scripta Metallurgica et Materiala
Journal Volume
33
Journal Issue
1
Pages
139-143
Date Issued
1995
Author(s)
Abstract
The results of the dry uni-directional sliding test for titanium aluminides are characterised by an initial transient state followed by a steady state. Among the four tested titanium aluminides, Ti-53Al exhibits the highest steady state friction coefficient μ and Ti-25Al exhibits the lowest. In addition, increasing sliding speed results in a longer initial transient stage and a significant decrease in the friction coefficient. The increasing applied load only affects μ slightly. Ploughing is the major friction mechanism in this experiment. During the sliding process, titanium aluminides are ploughed by the hard asperities of the steel roller surface, forming many ploughing grooves on the sample face. In addition to ploughing, adhesion is a significant friction mechanism for Ti-25Al. For the higher aluminum content aluminides, ploughing and asperity deformation both are contributing mechanisms. The microstructures of α2, α2 + γ or γ phases inherently formed in these titanium aluminides are closely related to the above wear mechanisms. © 1995.
SDGs
Type
journal article