Abstract
Fe{sub 3}Al produced by reaction synthesis was found to have higher yield strength over a wide range of temperatures compared to material of similar composition produced by conventional hot extrusion of prealloyed powder. The increase in strength is attributed to the smaller grain size of the reaction synthesized material. Essentially equal strain rate sensitivity has been observed for the materials produced by the different methods, with a maximum strain rate sensitivity coefficient of about 0.3. Super plasticity is not observed in the reaction synthesized material despite the material having a fine, stable, grain size. This is attributed primarily to particle pinning of the grain boundaries, and suggests that superplastic deformation is not necessarily expected to be a general property of iron aluminides in which a fine grained microstructure is formed.
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