Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

Abstract

Intermetallic titanium aluminides based on the ordered g-TiAl phase have gained increasing interest as innovative high-temperature light-weight structural materials. They have found application in aerospace and automotive industries and are still subject of worldwide research and development activities. Their attractive properties perfectly match the engine manufacturers' demands. This review, bridges the gap from the development of the TNM alloy through structural characterization with sophisticated in and ex situ methods, engineering properties, manufacturing, and processing technologies to all aspects of application. Because one thing is clear, the material still has great potential.

Ab initio study of chemical disorder as an effective stabilizing mechanism of bcc-based TiAl(+Mo)

“…For example, one local structural motif (lemon trapezium) in the first case changes to a clear rectangle with a = 2.886 Å and c = 4.061 Å upon a full relaxation. These values are notably similar to the γ -TiAl lattice parameters expressed in a tetragonal body-centered cell: a = 2.826 Å and c = 4.062 Å [11]. On the other hand, the blue area in Fig.…”

Microstructural, microhardness and electrochemical properties of heat-treated LENS in-situ synthesized Ti–Al-x(Mo, Si) alloys

“…The SEM measurements make it evident that Mo with 0.1 rpm resulted in microstructures with refined grains but the samples developed at 0.2 rpm Mo showed lager grained microstructures. Based on previous studies [ 42 , 54 ], it is evident that the as-built samples in Fig. 2 have near-gamma (NG) type microstructures.…”

Influence of Electron Beam Powder Bed Fusion Process Parameters at Constant Volumetric Energy Density on Surface Topography and Microstructural Homogeneity of a Titanium Aluminide Alloy

“…The SEM images after HT–1245 reveal a similar result. A mostly homogeneous NL γ microstructure composed of lamellar α 2 / γ ‐colonies and globular γ ‐grains, which is known for improved ductility, [ 53 ] could be adjusted in the samples SV–1 and LO–1. Again, all other investigated samples show inhomogeneous microstructures due to an irregular distribution of the γ ‐phase.…”