Papers by Carl-Magnus Arvhult
Journal of Alloys and Compounds, 2018
A thermodynamic description of the Fe-Te system modeled via the Calphad method is proposed, based... more A thermodynamic description of the Fe-Te system modeled via the Calphad method is proposed, based on data published in a preceding publication Part I: Experimental study, and that available in literature. End-member formation energies for the phases β , β ' , δ , δ ' and e , as well as lattice stabilities of FCC and BCC tellurium, have been evaluated via DFT and used in the numerical optimization. The final Gibbs energy models fit thermodynamic and phase diagram data well, and inconsistencies are discussed. The thermodynamic description is then used to evaluate Gibbs energy of formation for selected Fe-Te compounds of interest for the modeling of internal corrosion of stainless steel fuel pin cladding during operation of Liquid Metal-cooled Fast Reactors (LMFR).
In the pursuit of safer, more environmentally friendly and sustainable forms of energy production... more In the pursuit of safer, more environmentally friendly and sustainable forms of energy production for our ever growing demands, a type of nuclear reactor cooled by liquid metal instead of water is ...
As a part of the production of nitride nuclear fuel for use in fast nuclear reactors, zirconium i... more As a part of the production of nitride nuclear fuel for use in fast nuclear reactors, zirconium is hydrided followed by nitriding and mixing with uranium nitride. This work concludes a study of unw ...
Thermodynamic assessment of the Fe-Te system. Part I: Experimental study
A thermodynamic description of the Fe-Te system needs to be developed in order to model internal ... more A thermodynamic description of the Fe-Te system needs to be developed in order to model internal corrosion by fission products in fuel pins of Generation IV nuclear reactors. In preparation for a thermodynamic assessment of the system, an experimental study has been performed in order to clarify some unknown or conflicting phase diagram data. New phase diagram data have been obtained using Differential Thermal Analysis and isothermal heat treatments followed by electron microscopy with EDS and WDS analysis. The DTA analysis revealed new phase boundary data, and confirmed a very steep Fe-rich liquidus, supporting the possibility of a liquid miscibility gap in the Fe-FeTe region. The analyses also confirmed the probable eutectoid reaction δ → β + δ ' at 523 ° C . The invariant arrests of the unknown γ phase were consistent with information available in literature, but the phase was not identified via XRD of samples at its postulated composition. However, metallography of the sampl...
Validation of buoyant-mixing implementation in POLCA-T
Thermodynamic assessment of the Fe–Ni–Te system
Calphad
Journal of Materials Science
A thermodynamic assessment of the Ni-Te system has been performed using the Calphad method, based... more A thermodynamic assessment of the Ni-Te system has been performed using the Calphad method, based on experimental data available in the literature. The proposed description has been developed for use in the modeling of fissionproduct-induced internal corrosion of stainless steel cladding in Generation IV nuclear reactors. DFT calculations were performed to obtain 0 K properties of solid phases to assist the thermodynamic optimization. The ionic liquid twosublattice model was used, and most solution phases were modeled using interstitial metal sub-lattices. With a strict number of parameters, the resulting description satisfactorily reproduces all thermodynamic properties and hightemperature phase transitions. The metastable miscibility gap in the Ni-rich liquid that is experimentally suggested is not present in the final description. The d phase exhibits a metastable order-disorder transition between the CdI 2 and NiAs types of interstitial nickel distribution. The CdI 2 prototype is the stable space group at room temperature. Low-temperature ordering phase transitions have been disregarded in this description, since they are not of interest to the application of corrosion in nuclear reactors.
Journal of Phase Equilibria and Diffusion
Fe-Ni-Te alloys have been experimentally studied using isothermal heat treatments with SEM-EDS an... more Fe-Ni-Te alloys have been experimentally studied using isothermal heat treatments with SEM-EDS and WDS, XRD, and DTA in order to add phase diagram data for a thermodynamic assessment. This is for the application of fission product-induced corrosion of the stainless steel cladding of nuclear fuel pins, where Te is a key element. Phase diagram data are presented at 700 and 800 C, together with the solidus and liquidus temperatures from 44 to 80 at.% Te. Metallographic and XRD analysis show that the b2 phase forms as a Widmanstätten structure, preferentially precipitated in the s phase. SEM images show unidentified precipitates in several samples. Keywords isothermal equilibration Á microstructure Á phase diagram Á phase transformation Á thermal analysis Á ternary phase diagram
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Papers by Carl-Magnus Arvhult