The Technology of Titanium Aluminides for Aerospace Applications

Abstract

Ttanium aluminide intermetallics are of engineering interest due to an attractive combination of mechanical properties and density. This paper discusses the properties and processing of titanium aluminides, concentrating on near y-TiAl compositions. Inherent structural and deformation characteristics are described. The relationship between microstructure and prooessing is examined with emphasis placed on powder metallurgical, HIP'ing and hot deformation processes. Mechanical properties attainable wAh near y-TiAl alloys are presented and the effect of ternary elements examined.

Oxidation Behavior of Aluminide Coated Ti-Al-Cr-Nb-Zr-Y Alloys at High Temperatures

“…Intermetallic alloys of the Ti-Al system are developed to have combination of properties suitable for high temperature applications [1]. Nevertheless, applications of γ-TiAl-based materials face problems as they are relatively brittle.…”

Temperature changes and loads during hot-die forging of a gamma titanium–aluminide alloy

“…Gamma titanium-aluminide based alloys are being considered for many high performance applications because of their low density, high melting temperature, elevated temperature strength and modulus retention, resistance to oxidation and hydrogen absorption, and creep properties [1][2][3][4]. This combination of properties also makes them excellent choices for automotive engine valves.…”

Oxidation resistance improvement of Ti-50Al intermetallics by pre-oxidizing and subsequent polishing

“…Titanium aluminides have been investigated for aerospace and industrial applications in intermediate temperatures (600-850 • C) due to their high specific mechanical properties and satisfactory creep resistance [1][2]. However, the room temperature brittleness and poor oxidation resistance at temperature above 700 • C retard TiAl from practical applications.…”