Tensile flow and fracture behavior of DO3 Fe-25 at. pct Al and Fe-31 at. pct al alloys |
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Authors: | M G Mendiratta S K Ehlers D K Chatterjee H A Lipsitt |
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Affiliation: | (1) Universal Energy Systems Inc., 4401 Dayton-Xenia Road, 45432 Dayton, OH;(2) Research Laboratory, Eastman Kodak, 14650 Rochester, NY;(3) Wright State University, 45435 Dayton, OH |
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Abstract: | The tensile properties, fracture modes, and deformation mechanisms of two DO3 alloys, Fe-25 and Fe-31 at. pct Al, have been investigated as a function of temperature up to 600°C. The first alloy was
produced by powder metallurgy and hot-extrusion, the second by casting and hot-extrusion. At room temperature extensive plastic
deformation occurs in these intermetallics, exhibiting an elongation to fracture of 8 pct and 5.6 pct, respectively. In the
Fe-25Al alloy the deformation process consisted of motion and extensive cross-slip of ordinary dislocations and associated
formation of antiphase-boundary (APB) bands, while in the Fe-31 Al alloy, plasticity occurred by the motion of superlattice
dislocations which eventually dissociated to form APB bands. At room temperature both alloys exhibited transgranular cleavage
fracture modes. The variation of tensile properties and fracture modes with temperature is presented.
H. A. LIPSITT, formerly with the Materials Laboratory of the Air Force Wright Aeronautical Laboratories, Wright-Patterson
Air Force Base, OH 45433-6533 |
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