Abstract
Room-temperature ductility of iron aluminides is very sensitive to moisture in the testing environment. In a previous work, elongations in air were found to increase with decreasing relative humidity. Low ductility at room temperature has proved to be most significant deterrent to the fabrication and use of these alloys, although ternary alloy additions have increased their ductility. Liu, Lee and McKamey have demonstrated that the low room temperature ductility of Fe-Al alloys is due to environmental embrittlement. Liu et al. postulated that atomic hydrogen from the reduction of water vapor in air was probably the embrittling agent. Hydrogen embrittlement has been the subject of numerous experimental and theoretical investigations. Atomic hydrogen, when introduced into and subsequently absorbed in Fe{sub 3}Al alloys, may cause reduction in ductility of tensile specimens subjected to sustained static loading. In order to discuss the influence of hydrogen on the mechanical properties of Fe{sub 3}Al alloy, a simple elctrochemical procedure is conducted. From the results of the hydrogen-charged tensile specimens the hydrogen embrittlement characteristics of Fe{sub 3}Al alloys can be obtained.
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