High temperature behavior of two titanium aluminides for blade engine applications. Preliminary study

Abstract

The developmental tendencies in obtaining high performance of gas turbines are chiefly connected with an increase in the engine’s capacity, its efficiency, lifetime, and reduce the deleterious emissions. One way to achieve these targets is the usage of lighter and stronger materials and enhancing the method of parts manufacture. The present work is a part of a national project whose main goal is to develop a new class of light alloys-coatings structures for aerospace, energy and the automotive industry, fated to reduce pollution and to contribute to a friendlier environment. One way to enhancing the high temperature response against the severe environmental conditions, is by development of titanium aluminides with increased niobium content and two different structures: α2 + γ (Ti2Al + TiAl), and Orto AlNbTi2. The paper present the preliminary results on mechanical properties modification because of niobium content increased from 10 at.% to 25% and on beneficial influence of Thermal barrier coating.