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.

ALMANITE W

Alloy Digest ◽  
1974 ◽  
Vol 23 (3) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Impact Strength ◽  
Surface Treatment ◽  
High Hardness ◽  
Heat Treating ◽  
Austenitic Matrix ◽  
Matrix Type ◽  
Martensitic Matrix ◽  
Cast Condition

Abstract ALMANITE W comprises a series of three types of austenitic-martensitic white irons characterized by high hardness and relatively good impact strength. Type W1 has a pearlitic matrix. Type W2 has a martensitic matrix, Type W4 is highly alloyed to provide an austenitic matrix in the as-cast condition which may be further modified to give a martensitic matrix by heat treatment or by refrigeration. This datasheet provides information on composition, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on casting, heat treating, machining, and surface treatment. Filing Code: CI-42. Producer or source: Meehanite Metal Corporation.

RA 600

Alloy Digest ◽  
1967 ◽  
Vol 16 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Heat Treating ◽  
Chromium Alloy ◽  
Good Resistance ◽  
Good Oxidation Resistance ◽  
Nickel Base

Abstract RA-600 is a nickel-base chromium alloy having good oxidation resistance to 2150 F, and good resistance to carburizing and nitriding atmospheres. It is recommended for furnace construction and equipment. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-120. Producer or source: Rolled Alloys Inc..

ALCOA 1XXX SERIES

Alloy Digest ◽  
2005 ◽  
Vol 54 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Purity ◽  
High Conductivity ◽  
Good Corrosion Resistance

Abstract Aluminum 1xxx series alloys are nonhardenable by heat treatment. They have high purity, high conductivity, and good corrosion resistance and are easily formed. This datasheet provides information on composition, physical properties, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, machining, joining, and surface treatment. Filing Code: AL-395. Producer or source: Alcoa Engineered Products.

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