High-strength iron aluminide alloys
Past studies have shown that binary Fe{sub 3}Al possesses low creep-rupture strength compared to many other alloys, with creep-rupture lives of less than 5 h being reported for tests conducted at 593{degrees}C and 207 MPa. The combination of poor creep resistance and low room-temperature tensile ductility due to a susceptibility to environmentally-induced dynamic hydrogen embrittlement has limited use of these alloys for structural applications despite their excellent corrosion properties. With regard to the ductility problem, alloy development efforts have produced significant improvements, with ductilities of 10-20% and tensile yield strengths as high as 500 MPa being reported. Likewise, initial improvements in creep resistance have been realized through small additions of Mo, Nb, and Zr.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 450762
- Report Number(s):
- ORNL--6902; ON: DE97050725
- Country of Publication:
- United States
- Language:
- English
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Development of weldable high-strength iron aluminides
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