Point defect properties of tenary fcc Fe-Cr-Ni alloys

Point defect properties of tenary fcc Fe-Cr-Ni alloys

Point defect properties of tenary fcc Fe-Cr-Ni alloys 150 150 UKAEA Opendata
CCFE-PR(16)51

Point defect properties of tenary fcc Fe-Cr-Ni alloys

The properties of point defects in Fe-Cr-Ni alloys are investigated, using density functional theory (DFT), for two alloy compositions, Fe50Cr25Ni25 and Fe55Cr15Ni30, assuming various degrees of short-range order. DFT-based Monte Carlo simulations are applied to explore short-range order parameters and generate representative structures of alloys. Chemical potentials for the relevant structures are estimated from the minimum of the substitutional energy at representative atoms sites. Vacancies and <100> dumbbells are introduced in the Fe2CrNi intermetallic phase as well as in two Fe55Cr15Ni30 alloy structures: the disordered and short range-ordered structures, generated using Monte Carlo simulations at 2000 K and 300 K, respectively. Formation energies and relaxation volumes of defects as well as changes of magnetic moments caused by the presence of defects are investigated as functions of the local environment of a defect.

Collection:
Journals
Journal:
Nuclear Instruments and Methods in Physics Research Section B
Publisher:
Elsevier
Published date:
02/01/2017