Search for dissertations about: "Levente Vitos"

Showing result 11 - 15 of 38 swedish dissertations containing the words Levente Vitos.

  2. 11. Elastic properties and phase stability of shape memory alloys from first-principles theory

    Author : Chun-Mei Li; Levente Vitos; Bothina Hamad; KTH; []
    Keywords : TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract :  Ni-Mn-Ga and In-Tl are two examples of shape memory alloys. Their shape memory effect is controlled by the martensitic transformation from high temperature face-centered-cubic (fcc) phase to the low temperature face-centered-tetragonal (fct) phase. READ MORE

  4. 12. First-principles study of the multiple He trapping in defects in vanadium and SiC

    Author : Ruihuan Li; Levente Vitos; Anatoly Belonoshko; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : In fusion environment, large amount of helium (He) atoms are produced by transmutation along with structural damage in the structural materials, causing materials swelling and degrading of physical properties. In this thesis, using first-principles method, I examined the microscopic mechanism of He trapping in vacancies and voids in structural materials (vanadium solid and 6H–SiC composites). READ MORE

  5. 13. First-principles description of planar faults in metals and alloys

    Author : Wei Li; Vitos Levente; Göran Wahnström; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Phase interface and stacking fault are two common planar defects in metallic materials. In the present thesis, the interfacial energy and the generalized stacking fault energy of random alloys are investigated using density functional theory formulated within the exact muffin-tin orbitals (EMTO) method in combination with the coherent-potential approximation (CPA). READ MORE

  6. 14. First-principles description of planarfaults in metals and alloys

    Author : Wei Li; Levente Vitos; Ujfalassy Habil Balazs; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Phase interface and stacking fault are two common planar defects in metallic materials. In the present thesis, the interfacial energy and the generalized stacking fault energy of random alloys are investigated using density functional theory formulated within the exact muffin-tin orbitals (EMTO) method in combination with the coherent-potential approximation (CPA). READ MORE

  7. 15. First-principles study of materials for advanced energy technology

    Author : Xiaojie Li; Levente Vitos; Jian Sun; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials Science and Engineering; Teknisk materialvetenskap;

    Abstract : The present thesis addresses promising material solutions for fusion reactors from a theoretical point of view. We focus on two specific systems: W-based alloys used as plasma-facing materials and reduced activation ferritic/martensitic (RAFM) steels used as structural materials of breeding-blanket. READ MORE