Abstract
The room temperature embrittlement in air and the environment sensitivity of the ordered Fe[sub 3]Al alloy severely restrict its use. Recently, Liu et al. reported that room temperature ductility can be improved by the addition of chromium of 2 at%--6 at%. They found that with an additional chromium the fracture mode changed to one of approximately 50% transgranular cleavage and 50% intergranular failure. This experimental phenomenon was explained in terms of a combined effect of an easier cross slip, increasing cleavage strength and solid solution softening. The fracture surfaces of the hydrogen induced delayed fracture of the ordered Fe[sub 3]Al alloy, which cleavage fracture occurred at room temperature, are dependent upon K[sub I] and the hydrogen content. This work will investigate whether the fracture surfaces of hydrogen induced delayed fracture of ordered alloy Fe[sub 3]Al + Cr are dependent upon the K[sub I] and how the microstructure effects the hydrogen induced delayed fracture.
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