Application of electrochemical techniques for machining titanium aluminide-based alloys
Intermetallic materials with excellent resistance to high-temperature oxidation have been considered as potential replacements for superalloys used as aerospace materials. Titanium aluminides are especially attractive for this role. However, further commercialization of titanium aluminides requires the development of non-conventional machining, such as electrochemical machining (ECM). As a first attempt in the development of the ECM process, the corrosion behavior of arc-melted gamma TiAl and alpha 2 Ti3Al was investigated along with pure titanium and aluminum in deaerated and non-deaerated solutions of sulfuric acid, sodium sulfate, and sodium hydroxide. Two types of electrochemical experiments were carried out, namely, potentiodynamic and potentiostatic. In the Na2SO4 solution, the highest current was found for Al and the lowest for TiAl. The shape of the polarization curves indicates that the intermetallics show similar behavior to that of Ti. It has been found that, in sulfuric acid, current values decrease with increasing titanium content. In the sodium sulfate and sodium hydroxide solutions, current values initially decrease with increasing titanium content and remain unchanged for higher concentrations of titanium.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States); Oregon Graduate Institute of Science and Technology, Portland, OR
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 900587
- Report Number(s):
- DOE/ARC-1997-014; TRN: US200711%%349
- Resource Relation:
- Conference: 1st International Non-Ferrous Processing and Technology Conference, St. Louis, Missouri, Mar. 10-12, 1997
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALLOYS
ALUMINIUM
COMMERCIALIZATION
CORROSION
ELECTROCHEMICAL MACHINING
HEAT RESISTING ALLOYS
MACHINING
OXIDATION
POLARIZATION
PROCESSING
SHAPE
SODIUM HYDROXIDES
SODIUM SULFATES
SULFURIC ACID
TITANIUM
intermetallic materials
high-temperature oxidation
superalloys
titanium compounds
aluminum compounds
electrochemical machining
anodic polarization
passivation
aluminides
sodium hydroxide
aluminum base alloys