Investigation of structrural properties of the B2 phase in Al_xFeNiCrCo High Entropy Alloys.
AlxCoCrFeNi system is known, that fcc/bcc structures are observed dependent on x and thermal history of the sample. For experiments the samples were synthesized witch two different techniques, arc melting and a new method based on sintering of pure elements. As determined from an XRD, some amount of ordered B2 structure has been also found. This phase has already been reported and identified as AlNi-B2, but the identification was done by comparing formation energies of pure binary phases, possibly existing in the system. On the other hand the only certain information that can be obtained from XRD is that the Al atoms occupy one position of the B2 since the other components of the alloy are indistinguishable. Electronic structure calculations were performed in order to verify the most energetically favorable sublattice occupancy. Structures were analyzed using semi-ordered super cells with various atomic arrangements. Preliminary results indicate that (Al,Cr)-(Co,Ni) B2 phase tends to form (Fe-atoms are distributed randomly). It should be stressed here, that neutron diffraction is the only method, which allows for verification of the theoretically obtained results in this case
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CIESLAK Jakub; SUARD Emmanuelle and TOBOLA Janusz. (2015). Investigation of structrural properties of the B2 phase in Al_xFeNiCrCo High Entropy Alloys.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-670
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