Influence of alloy compositions on the halogen effect in TiAl alloys

2008 ◽  
Vol 59 (7) ◽  
pp. 609-618 ◽  
Author(s):  
P. J. Masset ◽  
S. Neve ◽  
H.‐E. Zschau ◽  
M. Schütze
Keyword(s):  
Tial Alloys ◽  
Halogen Effect

The halogen effect for improving the oxidation resistance of TiAl-alloys

2005 ◽  
Vol 22 (3) ◽  
pp. 309-314 ◽  
Author(s):  
A. Donchev ◽  
H.-E. Zschau ◽  
M. Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys ◽  
Halogen Effect

ToF-SIMS Study on the Initial Stages of the Halogen Effect in the Oxidation of TiAl Alloys

2017 ◽  
Vol 89 (1-2) ◽  
pp. 123-139 ◽  
Author(s):  
S. Friedle ◽  
R. Pflumm ◽  
A. Seyeux ◽  
P. Marcus ◽  
M. Schütze
Keyword(s):  
Tial Alloys ◽  
Tof Sims ◽  
Halogen Effect

The halogen effect for improving the oxidation resistance of TiAl-alloys

2005 ◽  
Vol 22 (3-4) ◽  
pp. 309-314 ◽  
Author(s):  
A. Donchev ◽  
H.-E. Zschau ◽  
M. Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys ◽  
Halogen Effect

Oxidation of TiAl Alloys Coated by Fluorine Resin in SO2 Containing Atmosphere

2010 ◽  
Vol 654-656 ◽  
pp. 562-565
Author(s):  
Aleksander Gil ◽  
Zbigniew Żurek ◽  
Adam Stawiarski
Keyword(s):  
Mechanical Properties ◽  
Ion Implantation ◽  
Surface Treatment ◽  
Oxidation Resistance ◽  
Organic Compounds ◽  
Oxidation Behavior ◽  
Alumina Scale ◽  
Tial Alloys ◽  
Temperature Range ◽  
Halogen Effect

There are several ways to improve the oxidation resistance of TiAl alloys. One of them is alloying with elements such as Nb, Ta, W, Si, Ag, Zr or Hf. However, bulk alloying influences the mechanical properties. Surface treatment of TiAl alloys by the small amounts of halogens leads to the formation of the protective alumina scale (“halogen effect”). The halogens can be applied by ion techniques (ion implantation, plasma immersion implantation) but also by spraying or dipping with halogen-containing inorganic and organic compounds. Deposition of the fluorine-containing resin on the surface of TiAl alloys is the easiest way to achieve the best results. SO2 impurity in air significantly influences oxidation behavior of TiAl alloys. In this work the results of the oxidation of a Ti-48Al-2Cr alloy coated with a fluorine-containing resin in the synthetic air and air containing 1% SO2 were presented. The oxidation runs were carried out in the temperature range 800-1000°C.

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
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