Evaluation of the intrinsic and extrinsic fracture behavior of iron aluminides

Conference · Thu Aug 01 00:00:00 EDT 1996

OSTI ID:458960

Kang, B S; Yao, Qizhou; Cooper, B R ^[1]

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1. West Virginia Univ., Morgantown, WV (United States)

Comparative creep crack growth tests of FA-186 and FA-187 iron aluminides under either dry oxygen or air environment showed that both alloys are susceptible to room temperature hydrogen embrittlement. Test results also revealed that FA-187 is intrinsically a more brittle material than FA-186. Atomistic computational modeling is being undertaken to find the preferred geometries, structures and formation energies of iron vacancies and vacancy pairs (Fe-Fe) in FeAl and Fe{sub 3}Al. An indication of vacancy clustering in Fe{sub 3}Al, with consequences for dislocation behavior, may be important for understanding the role of dislocation assisted diffusion in the hydrogen embrittlement mechanism.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• OSTI ID: 458960
• Report Number(s): ORNL/FMP-96/1; CONF-9605167-; ON: DE97050349; TRN: 97:001933-0029
• Resource Relation: Conference: 10. annual conference on fossil energy materials, Knoxville, TN (United States), 14-16 May 1996; Other Information: PBD: Aug 1996; Related Information: Is Part Of Proceedings of the tenth annual conference on fossil energy materials; Cole, N.C.; Judkins, R.R. [comps.]; PB: 551 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON BASE ALLOYS
CRACK PROPAGATION
HYDROGEN EMBRITTLEMENT
ALUMINIUM ALLOYS