Development of ductile Fe{sub 3}Al-based aluminides
- Oak Ridge National Lab., TN (United States)
Iron aluminides based on Fe{sub 3}Al are of interest because of their excellent oxidation and corrosion resistance, especially in sulfur-bearing atmospheres. Work at Oak Ridge National Laboratory (ORNL) has centered on developing Fe{sub 3}Al-based alloys with improved ambient temperature ductilities and increased strengths at temperatures of 600-700{degrees}C. Ambient temperature brittleness in this system is not {open_quotes}inherent{close_quotes}, but is caused by atomic hydrogen which is produced by an environmental reaction between aluminum in the alloy and water vapor in the atmosphere. Great strides have been made in understanding this embrittlement phenomenon, and the production of alloys with room temperature ductilities of over 10% and tensile yield strengths at 600{degrees}C of as high as 500 MPa is now possible through modifications in alloy composition and control of thermomechanical processing techniques. Creep rupture lives of over 200 h at 593{degrees}C (1,100{degrees}F) and 207 MPa (30 ksi) can also be produced through control of alloy composition and microstructure. This paper summarizes our present efforts to improve the tensile and creep-rupture properties and gives the status of efforts to commercialize Fe{sub 3}Al-based alloy compositions.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 140123
- Report Number(s):
- ORNL/FMP-93/1; CONF-9305135-; ON: DE94001091; TRN: 93:003927-0017
- Resource Relation:
- Conference: 7. annual conference on fossil energy materials, Oak Ridge, TN (United States), 11-13 May 1993; Other Information: PBD: Jul 1993; Related Information: Is Part Of Proceedings of the Seventh Annual Conference on Fossil Energy Materials; Fossil Energy AR and TD Materials Program; Cole, N.C.; Judkins, R.R. [comps.]; PB: 402 p.
- Country of Publication:
- United States
- Language:
- English
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