EFFECT OF ENVIRONMENT ON TENSILE DUCTILITY AND FRACTURE-TOUGHNESS OF IRON ALUMINIDES

Authors
KO SH GNANAMOORTHY R HANADA S
Citation
Sh. Ko et al., EFFECT OF ENVIRONMENT ON TENSILE DUCTILITY AND FRACTURE-TOUGHNESS OF IRON ALUMINIDES, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 222(2), 1997, pp. 133-139
Citations number
18
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
222
Issue
2
Year of publication
1997
Pages
133 - 139
Database
ISI
SICI code
0921-5093(1997)222:2<133:EOEOTD>2.0.ZU;2-D
Abstract
The effects of environment on the tensile ductility and fracture tough ness of Fe-28at.%Al and Fe-35at.%Al are investigated. Room-temperature fracture toughness of the iron aluminides investigated in air ranged between 35 and 40 MPa m(1/2), significantly higher than those of many ordered intermetallic alloys. A significant effect of environment is o bserved on the tensile ductility and fracture toughness. The effect of environment is more significant in Fe-35Al compared with Fe-28Al. The fracture surface morphology of the specimens tested differed in test environments in B2 ordered Fe-28Al and Fe-35Al, while in D0(3) ordered Fe-28Al it was more or less similar, mostly transgranular cleavage, i n all the environments tested. Increased intergranular fracture region s were observed in B2 ordered Fe-28Al and Fe-35Al when tested in vacuu m and oxygen, compared with that tested in air.