Sökning: "DISLOCATIONS"

Visar resultat 6 - 10 av 141 avhandlingar innehållade ordet DISLOCATIONS.

  1. 6. Creep Behaviour of Titanium Aluminides and its Relation to Phase Distributions and Dislocation Structures

    Författare :Dennis Lundström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gamma-TiAl; twinning; fatigue; dislocations; microstructure; thermal transport properties; creep;

    Sammanfattning : The need for more efficient gas turbines with lowered fuel consumption and thereby lowered emission has recently lead to increased interest in low-density, .gamma.-based TiAl intermetallic alloys as a replacement of e.g. LÄS MER

  3. 7. Design, Processing and Characterization of Silicon Carbide Diodes

    Författare :Uwe Zimmermann; KTH; []
    Nyckelord :silicon carbide; diodes; high-voltage; dislocations; electronics;

    Sammanfattning : Electronic power devices made of silicon carbide promisesuperior performance over today's silicon devices due toinherent material properties. As a result of the material'swide band gap of 3. LÄS MER

  4. 8. Modelling and simulation of plastic deformation on small scales : interface conditions and size effects of thin films

    Författare :Per Fredriksson; Peter Gudmundson; Christian Niordson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strain gradient plasticity; Size effects; Thin films; Interface; Finite element method; Dislocations; Constitutive behaviour; Hardening behaviour; Indentation; Contact mechanics; Metal matrix composites; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : Contrary to elastic deformation, plastic deformation of crystalline materials, such as metals, is size-dependent. Most commonly, this phenomenon is present but unnoticed, such as the effect of microstructural length scales. LÄS MER

  5. 9. Untersuchung der prozessabhängigen Ladungsträgerrekombination an Versetzungen in Siliziumsolarzellen

    Författare :Markus Rinio; Hans Joachim Möller; Deutschland der Technischen Universität Bergakademie Freiberg Fakultät für Chemie und Physik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dislocations; silicon; solar cell; LBIC; Solarzelle; Versetzung; Silicium; Rekombination; Getterung; Kurzschlussstrom; Blockguss; Physics; Fysik;

    Sammanfattning : Die Dissertation demonstriert ein Verfahren zur Messung der normalisierten Rekombinationsstärke (Gamma) von Versetzungen in blockerstarrten Siliziumsolarzellen. Es basiert auf der topografischen Messung der internen Quanteneffizienz IQE und der Versetzungsdichte. LÄS MER

  7. 10. Nanoindentation on coatings

    Författare :Zhi-Hui Xu; KTH; []
    Nyckelord :nanoindentation; Berkovich; thin coatings; deformation behaviour; mechanical properties; mechanism-based strain gradient theory; dislocations; cracks; pileup; indentation size effect; atomic force microscopy; diamond-like-carbon; alumina; gold; alumi;

    Sammanfattning : .... LÄS MER