Sökning: "Phase transformation"

Visar resultat 1 - 5 av 260 avhandlingar innehållade orden Phase transformation.

  1. 1. Phase transformation and stability studies of the Zr-H system

    Författare :Tuerdi Maimaitiyili; Lunds universitet.; Lund University.; Malmö University.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; zirconium hydride; γ-ZrH; synchrotron X-ray diffraction; neutron diffraction; hydrogen charging; in situ phase transformation; hydrogen embrittlement; hydrogen induced degradation; NATURAL SCIENCES; NATURVETENSKAP; Sciences; Zirconium hydride; Nuclear materials; phase transformation; in-situ hydrogen charging; hydrogen related degradation; powder diffraction; Rietveld analysis;

    Sammanfattning : Popular Abstract in English Zirconium alloys are widely used in nuclear power reactors as cladding material for their fuels due to the high strength, good corrosion resistance and low neutron absorption cross-section, even in extreme environment, that is characteristic for zirconium. The element, however, also has strong affinity for hydrogen, and when both are present they readily react and form a family of compounds called hydrides. LÄS MER

  2. 2. Finite element simulation of transformation plasticity in martensitic transformation

    Detta är en avhandling från Linköping : Linköpings universitet

    Författare :Kjell Simonsson; Linköpings universitet.; Linköpings universitet.; [1992]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase transformations. transformation plasticity; micromechanical models; martensitic transformation; finite element simulations. thermodynamics; moving interface; mechanical dissipation; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : This study is concerned with the simulation of transformation plasticity in martensitic transformation.In the first paper the concept of a transformation plasticity strain is introduced from a phenomenological point of view. LÄS MER

  3. 3. Transformation phenomena in a super duplex stainless steel

    Detta är en avhandling från Stockholm : Materialvetenskap

    Författare :Anders Wilson; KTH.; [2001]
    Nyckelord :Duplex stainless steel; Microstructure; Phase transformations; Precipitates; Sigma phase; Kinetics; Thermodynamic calculation; Continuous cooling transformation diagram; Time temperature transformation diagram; Computer model.;

    Sammanfattning : Duplex stainless steels consist of about equal fractions offerrite and austenite and are attractive due to their highcorrosion resistance against pitting corrosion and stresscorrosion cracking. The pitting corrosion resistance can bedescribed by the PREN value which is defined asPREN=%Cr+3.3*%Mo+16*%N. LÄS MER

  4. 4. In-situ phase studies of the Zr-H system

    Detta är en avhandling från Stockholm : Materialvetenskap

    Författare :Tuerdi Maimaitiyili; Lunds universitet.; Lund University.; Malmö University.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; in situ phase transformation; hydrogen embrittlement; hydrogen charging; zirconium hydride; γ-ZrH; synchrotron X-ray diffraction; neutron diffraction; hydrogen induced degradation; NATURAL SCIENCES; NATURVETENSKAP; Sciences; Zirconium hydride; phase transformation; in-situ hydrogen charging; hydrogen related degradation;

    Sammanfattning : Zirconium alloys are widely used in the nuclear industry because of their high strength, good corrosion resistance and low neutron absorption cross-section. However, zirconium has strong affinity for hydrogen, which may lead to hydrogen concentration build-up over time during a corrosion reaction when exposed to water. LÄS MER

  5. 5. Phase Transformations in Solid Pharmaceutical Materials Studied by AFM, ESCA, DSC and SAXS

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Denny Mahlin; Uppsala universitet.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; polymer; lipid; lactose; phase transformation; phase formation; crystallisation; AFM; X-ray diffraction; ESCA; DSC; solid dispersion; Fysikalisk kemi; NATURAL SCIENCES Chemistry Physical chemistry; NATURVETENSKAP Kemi Fysikalisk kemi;

    Sammanfattning : Mixing excipients is a common way to produce pharmaceutical materials with suitable properties for drug formulation. An understanding of the basic mechanisms involved in the formation and transformation of the structures of solid state mixtures is crucial if one is to be able to produce materials with the desired properties in a reliable way. LÄS MER