Improvement in Oxidation Resistance of the Ti-31&sim;39 mass%Al Alloys by Heat Treatment under a Low Partial Pressure Oxygen Atmosphere

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.

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Improvement of Oxidation Resistance for TiAl by Surface Treatments under a Low Partial Pressure Oxygen Atmosphere and Aluminum Diffusion Coating

Tetsu-to-Hagane ◽

10.2355/tetsutohagane1955.77.2_274 ◽

1991 ◽

Vol 77 (2) ◽

pp. 274-281 ◽

Cited By ~ 6

Author(s):

Michiko YOSHIHARA ◽

Tetsuya SUZUKI ◽

Ryohei TANAKA

Keyword(s):

Partial Pressure ◽

Oxidation Resistance ◽

Diffusion Coating ◽

Surface Treatments ◽

Oxygen Atmosphere ◽

Pressure Oxygen

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Improvement of Oxidation Resistance for TiAl by Surface Treatment under a Low Partial Pressure Oxygen Atmosphere and Aluminum Diffusion Coating.

ISIJ International ◽

10.2355/isijinternational.31.1201 ◽

1991 ◽

Vol 31 (10) ◽

pp. 1201-1206 ◽

Cited By ~ 28

Author(s):

Michiko Yoshihara ◽

Tetsuya Suzuki ◽

Ryohei Tanaka

Keyword(s):

Partial Pressure ◽

Surface Treatment ◽

Oxidation Resistance ◽

Diffusion Coating ◽

Oxygen Atmosphere ◽

Pressure Oxygen

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Effect of Heat Treatment under Low Oxygen Partial Pressure Atmosphere on Oxidation Resistance of Intermetallic Compound TiAl

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet1952.53.2_251 ◽

1989 ◽

Vol 53 (2) ◽

pp. 251-252 ◽

Cited By ~ 37

Author(s):

Equo Kobayashi ◽

Michiko Yoshihara ◽

Ryohei Tanaka

Keyword(s):

Heat Treatment ◽

Intermetallic Compound ◽

Oxygen Partial Pressure ◽

Partial Pressure ◽

Oxidation Resistance ◽

Low Oxygen ◽

Compound Tial

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

MRS Proceedings ◽

10.1557/proc-364-1189 ◽

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.

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