In situ TEM observations of dislocation/anti-phase boundary interactions |
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Authors: | Yifeng Liao Ian Baker |
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Institution: | 1. Thayer School of Engineering, Dartmouth College , Hanover, NH 03755, USA yifeng-liao@northwestern.edu;3. Thayer School of Engineering, Dartmouth College , Hanover, NH 03755, USA |
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Abstract: | L21-ordered Fe59Mn17Al24 (in at%) single crystals were in situ strained at either 300?K or 700?K in a transmission electron microscope. At 300?K, the strain was accommodated by the glide of four-fold dissociated super-dislocations, whereas, at 700?K, the strain was accommodated by the glide of a/2?111? partials. Dislocation pile-ups occurred at a/4?111? thermal anti-phase boundaries (APBs). Screw super-dislocations frequently cross-slipped when they encountered the thermal APBs, while mixed dislocations tended to be pinned at them. This impediment is attributed to the creation of new APB segments when dislocations pass through the curvy thermal APBs. |
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Keywords: | anti-phase boundary in situ electron microscopy dislocations intermetallics |
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