scholarly journals Oxidation Resistance and Effects of the Heat Treatment under Low Partial Pressure Oxygen Atmosphere in Intermetallic Compound TiAl Containing Nb

1993 ◽  
Vol 57 (5) ◽  
pp. 574-581 ◽  
Author(s):  
Michiko Yoshihara ◽  
Naochika Imamura ◽  
Equo Kobayashi ◽  
Kenji Miura ◽  
Yoshinao Mishima ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Intermetallic Compound ◽  
Partial Pressure ◽  
Oxidation Resistance ◽  
Oxygen Atmosphere ◽  
Pressure Oxygen ◽  
Compound Tial

Development of Surface Treatment Techniques to Improve Oxidation Resistance of Titanium Aluminide

1990 ◽  
Vol 213 ◽  
Author(s):  
Michiko Yoshihara ◽  
Ryohei Tanaka ◽  
Tetuya Suzuki ◽  
Masayuki Shimizu
Keyword(s):  
Heat Treatment ◽  
Partial Pressure ◽  
Surface Treatment ◽  
Oxidation Resistance ◽  
Titanium Aluminide ◽  
Combined Treatment ◽  
Diffusion Coating ◽  
Oxygen Atmosphere ◽  
Preferential Formation ◽  
Pressure Oxygen

ABSTRACTThe oxidation resistance of intermetallic compound TiAl was greatly improved in cyclic heating at 900°C by means of a new type of surface treatment, which is the heat treatment under a low partial pressure oxygen atmosphere. The treatment becomes more effective with increasing aluminum content in the specimen. It was presumed that the excellent oxidation resistance resulting from this method is due to preferential formation of a thin and tighit Al2 O3 surface layer, which is formed during the surface treatment at a temperature vicinity of 1000°C and air pressure of about 10−3 Pa. The oxidation resistance of Al2O3 film formed, however, was found to be insufficient at 950°C. A combined treatment consisting of the heat treatment under a low partial pressure oxygen atmosphere followed by a diffusion coating with aluminum showed an excellent resistance to cyclic oxidation even at 950°C.

Effect of Surface Treatment on the Formation of Oxygen Enriched Brittle Layer in A Ti3A1-Nb Alloy

1994 ◽  
Vol 364 ◽  
Author(s):  
B. Zhang ◽  
X. Wan ◽  
D. Li ◽  
J. Wang ◽  
H. Wang ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Partial Pressure ◽  
Surface Treatment ◽  
Thermal Exposure ◽  
Nitride Layer ◽  
Oxygen Atmosphere ◽  
Pressure Oxygen ◽  
Brittle Layer ◽  
Vapor Deposit ◽  
Effect Of Surface

AbstractEffect of surface treatment on the formation of oxygen enriched brittle layer in a Ti3Al-Nb alloy was investigated. The results show that a mixed Ti2N and TiN layer was formed at the surface by the titanium nitride vapor deposit treatment, and this titanium nitride layer makes it possible to suppress the formation of the oxygen enriched brittle layer during thermal exposure. An Al2O3 film was formed at the surface of the alloy, when the surface treatment was conducted under a low partial pressure oxygen atmosphere. However, such surface treatment is not able to depress the formation of the oxygen enriched brittle layer during thermal exposure, due to the higher affinity of α2 phase for oxygen as well as the higher diffusivity of titanium in Al2O3.

Atomic structure of interface of intermetallic compound TiAl and nitride Ti2AIN using HREM and image processing

1991 ◽  
Vol 49 ◽  
pp. 570-571
Author(s):  
E. Sukedai ◽  
H. Mabuchi ◽  
H. Hashimoto ◽  
Y. Nakayama
Keyword(s):  
Mechanical Properties ◽  
Image Processing ◽  
Composite Material ◽  
Intermetallic Compound ◽  
Side Surface ◽  
High Resolution Electron Microscopy ◽  
Hexagonal Structure ◽  
Second Phase ◽  
Resolution Electron ◽  
Compound Tial

In order to improve the mechanical properties of an intermetal1ic compound TiAl, a composite material of TiAl involving a second phase Ti2AIN was prepared by a new combustion reaction method. It is found that Ti2AIN (hexagonal structure) is a rod shape as shown in Fig.1 and its side surface is almost parallel to the basal plane, and this composite material has distinguished strength at elevated temperature and considerable toughness at room temperature comparing with TiAl single phase material. Since the property of the interface of composite materials has strong influences to their mechanical properties, the structure of the interface of intermetallic compound and nitride on the areas corresponding to 2, 3 and 4 as shown in Fig.1 was investigated using high resolution electron microscopy and image processing.

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