ELEVATED-TEMPERATURE BEHAVIOR OF FE3AL WITH CHROMIUM ADDITIONS

A variety of elevated temperature testing has been performed on Fe3Al containing 2% and 5% chromium that was produced by inert gas atomization and consolidated by hot extrusion. Creep rupture tests indicate that the 5% chromium results in a slight reduction of time to rupture over the 2% chromium alloy. However, Larson-Miller plots indicate that this difference may be insignificant. Elevated temperature tensile and compressive tests have been performed, and both 2% and 5% chromium alloys exhibit wavy flow for certain strain rate-temperature regimes, which may be evidence of dynamic strain aging. Although total elongations of greater than 100% can be obtained by tensile testing at 800-degrees-C, strain rate jump tests indicate that these materials do not have strain rate sensitivity values as high as those typically found in superplastic materials.