A New Microstructural View of Creep in Near-γ TiAl-Alloys

1999 ◽  
Vol 171-174 ◽  
pp. 701-708 ◽  
Author(s):  
Birgit Skrotzki
Keyword(s):  
Tial Alloys

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

Robustness versus Performance Assessment for Different Gamma-TiAl Processing Routes

2011 ◽  
Vol 1295 ◽  
Author(s):  
Marc Thomas
Keyword(s):  
High Performance ◽  
Cost Effective ◽  
Processing Route ◽  
Transportation Industry ◽  
Tial Alloys ◽  
Alternative Processing ◽  
Aerospace Applications ◽  
Robust Processing ◽  
Processing Techniques ◽  
Robust Process

ABSTRACTOne of the main driving force for the development of advanced structural materials is weight saving especially in the transportation industry in order to reduce CO2 emission. The utilization of gamma aluminides, as good candidates for aerospace applications, is strongly related to the development of a cost-effective and robust processing route, as far as possible. It is well established that the processing route, i.e. cast, wrought or PM, has a dramatic effect on the microstructure and texture of gamma-TiAl alloys. Therefore, significant microstructural variations through post-heat treatments coupled with compositional modifications can only guarantee a proper balance of desired properties. However, a number of metallurgical factors during the processing steps can contribute to some scattering in properties. This review will highlight several critical process variables in terms of the resulting g-TiAl microstructures. Of primary importance is the as-cast texture which is difficult to control and may contribute to prefer some alternative processing routes to ensure a better repeatability in mechanical results. Some innovative processing techniques for controlling the structure will then be presented. The main point which will be discussed in this paper is whether an approach leading to a robust process would not be at the expense of the high performance of the structural material.

Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature

2014 ◽  
Vol 43 (3) ◽  
pp. 540-543 ◽  
Author(s):  
Zhe Wang ◽  
Rui Cao ◽  
Jianhong Chen ◽  
Ji Zhang
Keyword(s):  
Room Temperature ◽  
Toughening Mechanisms ◽  
Tial Alloys ◽  
B2 Phase

Magnetic field in a near-rectangular cold crucible designed for continuously melting and directionally solidifying TiAl alloys

2012 ◽  
Vol 212 (9) ◽  
pp. 1934-1940 ◽  
Author(s):  
Ruirun Chen ◽  
Jieren Yang ◽  
Hongsheng Ding ◽  
Feng Huang ◽  
Yanqing Su ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cold Crucible ◽  
Tial Alloys

Improvement of the Oxidation Resistance of TiAl Alloys Using Controlled Gaseous Fluorination

2019 ◽  
Vol 11 (15) ◽  
pp. 37-48 ◽  
Author(s):  
Patrick J. Masset ◽  
Michael Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys

scholarly journals Deformation Behavior at High Temperatures in TiAl Alloys Containing TiN Particles.

1997 ◽  
Vol 44 (6) ◽  
pp. 577-581
Author(s):  
Shouichi Ochiai ◽  
Hitoshi Takeda ◽  
Yoshiro Kojima ◽  
Shunji Kikuhara
Keyword(s):  
High Temperatures ◽  
Deformation Behavior ◽  
Tial Alloys

Microstructural control through seeding and directional solidification of TiAl alloys containing Mo and C

2000 ◽  
Vol 48 (12) ◽  
pp. 3221-3233 ◽  
Author(s):  
H.N Lee ◽  
D.R Johnson ◽  
H Inui ◽  
M.H Oh ◽  
D.M Wee ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Tial Alloys ◽  
Microstructural Control

The Use of In Situ Characterization Techniques for the Development of Intermetallic Titanium Aluminides

2014 ◽  
Vol 783-786 ◽  
pp. 2097-2102 ◽  
Author(s):  
Svea Mayer ◽  
Emanuel Schwaighofer ◽  
Martin Schloffer ◽  
Helmut Clemens
Keyword(s):  
Titanium Aluminides ◽  
Turbine Blades ◽  
Heat Treatments ◽  
Mechanical Processing ◽  
Tial Alloys ◽  
Solidification Processes ◽  
Consistent Picture ◽  
Aero Engines ◽  
Multi Phase

Urgent needs concerning energy efficiency and environmental politics require novel approaches to materials design. One recent example is thereby the implementation of light-weight intermetallic titanium aluminides as structural materials for the application in turbine blades of aero-engines as well as in turbocharger turbine wheels for the next generation of automotive engines. Each production process leads to specific microstructures which can be altered and optimized by thermo-mechanical processing and / or subsequent heat-treatments. To develop sound and sustainable processing routes, knowledge on solidification processes and phase transformation sequences in advanced TiAl alloys is fundamental. Therefore, in-situ diffraction techniques employing synchrotron radiation and neutrons were used for establishing phase fraction diagrams, investigating advanced heat-treatments as well as for optimizing thermo-mechanical processing. Summarizing all results a consistent picture regarding microstructure formation and its impact on mechanical properties in advanced multi-phase TiAl alloys can be given.

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