Abstract
Intermetallic titanium aluminide alloys are used in the high technology engineering field with the goal of achieving weight reduction in different components, exposed to corrosive environments and high temperatures in aeronautical and automotive industries. Despite their attractive properties such as low density, high strength, high stiffness and good corrosion, creep and oxidation resistance, the machinability of titanium aluminide alloys is difficult due to its high hardness, chemical reactivity, and low ductility. This article reviews the state of the art regarding the machinability of titanium aluminide alloys and focuses on the analysis of the milling process, namely the process parameters, surface integrity and cutting tools. The influence of titanium aluminides properties on the machinability is also discussed presenting some current trends and further needed research.
Highlights
In the aerospace and automotive industries, Gamma titanium aluminide alloys are presented as a better alternative in parts which are exposed to work temperatures around 800°C (Appel and Wagner 2001)
The properties of titanium aluminides such as high strength at elevated temperature produced during machining, high elastic modulus and chemical reactivity, thermal conductivity and low ductility have an adverse effect on the machinability of these intermetallic alloys
Most of the research focuses on the adverse influence of low ductility and strength at high temperature, that leads to a lower surface integrity, sub-surface micro hardening, higher instability of the machining process and the fast wear of tool cutting edge
Summary
In the aerospace and automotive industries, Gamma titanium aluminide alloys are presented as a better alternative in parts which are exposed to work temperatures around 800°C (Appel and Wagner 2001). Industrial Research, Mechanization, Technological Process, Milling, Gamma Titanium Aluminides, Surface Quality In the titanium aluminides machining field, a lack of specific technical information such as cutting parameters, tool geometries, tools materials, coatings, cutting fluids, among others, slow down their commercial use and research.
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