Sökning: "stacking"

Visar resultat 26 - 30 av 196 avhandlingar innehållade ordet stacking.

  1. 26. Ab initio Interlayer Potentials For Metals and Alloys

    Författare :Fuyang Tian; Levente Vitos; Nanxian Chen; Docent Kalevi Kokko; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mobius inversion; Potentials; EMTO; Järnvägsgruppen - Effektiva tågsystem för godstrafik; Järnvägsgruppen - Effektiva tågsystem för godstrafik; Järnvägsgruppen - Effektiva tågsystem för persontrafik; Järnvägsgruppen - Effektiva tågsystem för persontrafik;

    Sammanfattning : Many modern materials and material systems are layered. The properties related to layers are connected to interactions between atomic layers. In the present thesis, we introduce the interlayer potential (ILP), a novel model potential which fully describes the interaction between layers. LÄS MER

  3. 27. First-principles description of planarfaults in metals and alloys

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

    Sammanfattning : 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). LÄS MER

  4. 28. Defects in Austenitic Steels and Hard Metals - A DFT-based Study

    Författare :Ruiwen Xie; Levente Vitos; Ilja Turek; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; defects; austenitic steels; cemented carbides; ab-initio; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : Materials are never 100% pure due to the limitation of purification method or manufacturing process. Nor are they perfect, especially under deformation. The present work aims to explore different roles played by the defects in austenitic steels and hard metals. LÄS MER

  5. 29. Carbon Effect on Mechanical Properties in Austenitic Steels - A DFT-based Study

    Författare :Ruiwen Xie; Levente Vitos; Pär Olsson; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : To study the effect of carbon interstitials in austenitic steels on plastic deformation mechanisms is the main goal of the present thesis. Using first-principlesmethods, the generalized stacking fault energy (GSFE) of C-alloyed γ-Fe is firstcalculated. The GSFE curve includes several prominent stacking fault energiesthat are fundamental for, e. LÄS MER

  7. 30. Modelling of Dislocation Bias in FCC Materials

    Författare :Zhongwen Chang; Pär Olsson; Christophe Domain; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Irradiation induced void swelling is problematic for the application of austenitic steels under high dose irradiation. In this thesis, the swelling is characterized by dislocation bias. The dislocation bias is obtained using the finite element method, accounting for fcc copper and nickel under electron irradiation. LÄS MER