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3 results on '"Huminiuc T"'

1. Spontaneous exchange bias formation driven by a structural phase transition in the antiferromagnetic material

Author

Migliorini A., Kuerbanjiang B., Huminiuc T., Kepaptsoglou D., Muñoz M., Cuñado J.L.F., Camarero J., Aroca C., Vallejo-Fernández G., Lazarov V.K., Prieto J.L. and We thank K. O’Grady for his helpful discussions. This work has been funded by the Spanish Ministerio de Economía y Competitividad through the projects MAT2014-52477-C5-1-P and MAT2014-52477-C5-3-P and by the Spanish Consejo Social of the Universidad Politécnica de Madrid through the scholarship ‘Ayuda del Consejo Social para el Fomento de la formación y la Internacionalización de Doctorandos’, awarded for a three months internship at the University of York. V.K.L. thanks the funding support by EPSRC grant EP/K03278X/1. J.C. and J.L.F.C. thank support by MINECO through Projects FIS2016-78591-C3-1-R and SEV-2016-0686 and by Comunidad de Madrid through Project S2013/MIT-2850.

Published
2018

3. Investigation on the Thermodynamic Stability of Nanocrystalline W-Based Alloys: A Combined Theoretical and Experimental Approach

Author

Antonio Mario Locci, Antonio Rinaldi, Tomas Polcar, Francesco Torre, Daniele Mirabile Gattia, Francesco Delogu, Teodor Huminiuc, Claudio Mingazzini, Torre, F., Mingazzini, C., Gattia, D. M., Huminiuc, T., Rinaldi, A., Polcar, T., Delogu, F., and Locci, A. M.

Subjects
Technology, Work (thermodynamics), Materials science, Thermodynamics, 02 engineering and technology, nanocrystalline alloys, thermal stability, thermodynamics, 01 natural sciences, 7. Clean energy, Stability (probability), Article, Annealing (glass), Condensed Matter::Materials Science, 0103 physical sciences, General Materials Science, Thermal stability, 010302 applied physics, Microscopy, QC120-168.85, Mathematical model, QH201-278.5, Engineering (General). Civil engineering (General), 021001 nanoscience & nanotechnology, Nanocrystalline material, TK1-9971, Descriptive and experimental mechanics, Nanocrystalline alloys, Chemical stability, Electrical engineering. Electronics. Nuclear engineering, TA1-2040, 0210 nano-technology, Solid solution
Abstract

The stability of nanostructured metal alloys is currently being extensively investigated, and several mathematical models have been developed to describe the thermodynamics of these systems. However, model capability in terms of thermal stability predictions strongly relies on grain boundary-related parameters that are difficult to measure or estimate accurately. To overcome this limitation, a novel theoretical approach is proposed and adopted in this work to identify W-based nanocrystalline alloys which are potentially able to show thermodynamic stability. A comparison between model outcomes and experimental findings is reported for two selected alloys, namely W-Ag and W-Al. Experimental results clearly highlight that W-Ag mixtures retain a segregated structure on relatively coarse length scales even after prolonged mechanical treatments. Moreover, annealing at moderate temperatures readily induces demixing of the constituent elements. In contrast, homogeneous nanostructured W-Al solid solutions are obtained by ball milling of elemental powders. These alloys show enhanced thermal stability with respect to pure W even at high homologous temperatures. Experimental evidences agree with model predictions for both the investigated systems.

Published
2021

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