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fe3al ji he jin shi wen su xing de gai shan
Pages: 49-56
Year: Issue:  3
Journal: Transactions of Materials and Heat Treatment

Keyword:  Fe3Alsite occupation of atomssubstitutional elementsductilitythermomechanical treatment;
Abstract: Based on the systematic investigation of the room temperature tensile properties of Fe3Al based intermetallic alloy under different surface conditions,phase structures,grain morphologies and in vacuum and air,the experimental results showed that only Cr improved ductility among the additions of Cr,Mo,Ti,Mn,Ni and Si.In order to understand the mechanism of room temperature mechanical properties,the site occupation of these substitutional atoms at sublattice in DO3 type stocichiometric Fe3Al intermetallics was determined by means of neutron difractometry, and the corresponding interaction energy between different atom pairs calculated.Cr atoms substitute for the Fe atoms located at the next nearest neighbor of Al atoms.Since the interaction energy of AlCr pair is lower than that of FeAl pair,the correstponding APB energy decreased and cross slip is activated more frequently. This is confirmed by the investigation of the surface slip lines of deformed samples,dislocation configuration and antiphase boundaries of dislocation move trace. This study also demonstrated that B2 themomechanical treatment significantly increased both the tensile strength and ducitility.The improvement of room temperature mechanical properties by this processing can be attributed to three factors:B2 structure,elongated flattened grains and surface oxidation scales.
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