Sökning: "surface segregation"

Visar resultat 1 - 5 av 74 avhandlingar innehållade orden surface segregation.

  1. 1. Understanding surface defects on direct chill cast 6xxx aluminium billets

    Författare :Mikael Erdegren; Torbjörn Carlberg; Mittuniversitetet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Aluminium; billets; DC casting; segregation; surface defects; vertical drags; Bridgman furnace; dewetting; non-wettable; nanocomp; Metcast ST20; graphite ring; titanium-butoxide;

    Sammanfattning : .... LÄS MER

  2. 2. Investigation of Surface Formation in As-Cast and Homogenized 6xxx Aluminium Billets

    Författare :Nazlin Bayat; Torbjörn Carlberg; Håkan Olin; Yanjun Li; Mittuniversitetet; []
    Nyckelord :DC casting; surface segregation; surface defects; intermetallic phase; phase transformation; homogenization;

    Sammanfattning : The direct chill (DC) casting technique to produce billets for extrusion and ingots for rollingwas developed in the 1930s. The principle, which is still valid, is a two-stage cooling with a primary cooling at a mould surface followed by water spraying directly on the surface. LÄS MER

  3. 3. Phase-field modeling of surface-energy driven processes

    Författare :Klara Asp Grönhagen; John Ågren; Suzana Fries; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Phase-field method; surface energy; solute drag; solid-state sintering; multicomponent multiphase flow; wetting; liquid-phase sintering; spinodal decomposition; CALPHAD; Materials science; Teknisk materialvetenskap;

    Sammanfattning : Surface energy plays a major role in many phenomena that are important in technological and industrial processes, for example in wetting, grain growth and sintering. In this thesis, such surface-energy driven processes are studied by means of the phase-field method. LÄS MER

  4. 4. Phase Segregation and Microstructural Changes in Starch - Protein Systems

    Författare :Carla Quiroga; Livsmedelsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Patatin; ß-Lactoglobulin; Amylopectin; Phase Segregation; Amylose; Macromolecular chemistry; Makromolekylär kemi;

    Sammanfattning : This thesis presents the study of the phase behavior of starch ? protein systems in relation to their microstructure and mechanical properties. To study the complexity of this multicomponent system, the main components of starch (amylopectin and amylose) were studied separately in presence of a protein (ß-lactoglobulin or patatin). LÄS MER

  5. 5. Free Metal Clusters Studied by Photoelectron Spectroscopy

    Författare :Tomas Andersson; Olle Björneholm; Maxim Tchaplyguine; Paolo Piseri; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; clusters; nanoparticles; electronic structure; photoelectron spectroscopy; synchrotron radiation; surface segregation; nanoalloys; size-dependence; metallicity; plasmons; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Clusters are aggregates of a finite number of atoms or molecules. In the present work, free clusters out of metallic parent materials have been created and studied by synchrotron radiation-based photoelectron spectroscopy. The clusters have been formed and studied in a beam and the electronic structure of the clusters has been investigated. LÄS MER