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Proper addition of 0.002 wt-% Mg to cast Fe_3Al alloy may obviously improve the room andhigh temperature tensile properties.Auger spectra show that Mg segregates near grainboundaries as very thin layers.Observation under TEM reveals that a suitable amount of Mgenhances ability of cooperative internal deformation so that the dislocations will ease the con-tinuous slip deformation through grain boundaries.The fracture feature of Fe_3Al alloy is oftransgranular cleavage at room temperature and cracks initiate at grain boundaries.
Proper addition of 0.002 wt-% Mg to cast Fe 3 Al alloy may obviously improve the room and high temperature tensile properties. Auger spectra show that Mg segregates near grainboundaries as very thin layers. Observation under TEM reveals that a suitable amount of M enhances ability of cooperative internal deformation so that the dislocations will ease the con-tinuous slip deformation through grain boundaries. The fracture feature of Fe_3Al alloy is of transgranular cleavage at room temperature and ab initio at grain boundaries.