Titanium Aluminide-Based Intermetallic Alloys

A spectrum image can be acquired with a scanning transmission electron microscope (STEM) by translating a focused probe over a two-dimensional area of a specimen and acquiring a spectrum at an array of positions of the probe. Analogously, a rocking-beam spectrum image is formed when the incident electron beam is tilted relative to the specimen and a series of spectra is acquired from a single volume of the specimen. The orientation-dependence of such a series of spectra can be used to extract the atomic site-distributions of an ordered alloy or compound. One of the drawbacks of spectrum image acquisition is that the raw images are typically files of many megabytes, whereas the actual information of interest may be reducible to a fraction of this size. The dimension of the data set may be reduced by a number of methods. For example, Rossouw and coworkers have acquired rocking-beam X-ray maps for the characterization of atomic site-distributions in titanium aluminide intermetallic alloys.

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Metallurgical and Fabrication Factors Relevant to Fracture Mechanism of Titanium-Aluminide Intermetallic Alloys

Lightweight Alloys for Aerospace Application ◽

10.1002/9781118787922.ch17 ◽

2013 ◽

pp. 183-191

Author(s):

K. Nikbin

Keyword(s):

Fracture Mechanism ◽

Titanium Aluminide ◽

Intermetallic Alloys

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Interdiffusion and Phase Relations in Ti-Aluminide/NB/Ti-Aluminide Composite Structures

MRS Proceedings ◽

10.1557/proc-273-59 ◽

1992 ◽

Vol 273 ◽

Cited By ~ 2

Author(s):

Z. Ma ◽

M. A. Dayananda ◽

L. H. Allen

Keyword(s):

Titanium Aluminide ◽

Composite Structures ◽

Phase Relations ◽

Diffusion Annealing ◽

Intermetallic Alloys ◽

X Ray Diffraction ◽

X Ray ◽

State Diffusion ◽

Diffusion Paths ◽

Bonding Technique

ABSTRACTWe have studied interdiffusion and phase relations in two titanium aluminide/Nb/titanium aluminide composite structures at 1100 °C using solid state diffusion approach. The composite structures were prepared with two practical intermetallic alloys, γ (Ti-48Al-2Nb-0.3Ta, in at.%) alloy and super-α2 (Ti-25Al-10Nb-3V-1Mo, in at.%) alloy, and pure Nb sheet by diffusion bonding technique. The interfacial microstructures evolved during thermal diffusion annealing were characterized using optical microscopy, SEM, TEM and X-ray diffraction. The effect of Nb on the phase stabilities of two intermetallic alloys and the phase relations among different phases formed in the diffusion zone due to interdiffusion were analyzed in terms of rules of diffusion paths on the basis of the observed diffusion structures and experimental diffusion paths.

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