Sökning: "high-entropy alloys"

Visar resultat 6 - 10 av 31 avhandlingar innehållade orden high-entropy alloys.

  1. 6. Refractory High-entropy Alloy and Nitride Thin Films

    Författare :Rui Shu; Per Eklund; Arnaud Le Febvrier; Alfred Ludwig; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High-entropy alloy; nitrides; magnetron sputtering; superconductor; irradiation-tolerance; protective coating.;

    Sammanfattning : This thesis focuses on understanding the process-structure-property relation-ships for several refractory-metal-based high-entropy alloys and nitrides synthesized by magnetron sputtering.  The thesis begins with the growth of TiZrNbTaNx understoichiometric nitrides by controlling substrate temperature and nitrogen flow ratio fN. LÄS MER

  3. 7. Characterization and Modification of Microstructure in Al-Co-Cr-Fe-Ni Eutectic High-Entropy Alloys

    Författare :Adrianna Lozinko; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; eutectic alloys; solidification; orientation relationship; high-entropy alloys; microstructure; EBSD; recrystallization;

    Sammanfattning : The recently emerging high-entropy alloys (HEAs) present a novel alloying strategy, significantly expanding the scope of metal alloy design. HEAs are defined as alloys consisting of at least four principal elements in equi- or near equiatomic ratios, with a possibility of small amounts of alloying elements. LÄS MER

  4. 8. Microstructure development and mechanical properties of cast and thermo-mechanically treated eutectic high-entropy alloys

    Författare :Adrianna Lozinko; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; strength-ductility trade-off; eutectic alloys; recrystallization; EBSD; heterogeneous structure; high-entropy alloys;

    Sammanfattning : The recently emerging high-entropy alloys (HEAs) present a novel alloying strategy, significantly expanding the scope of metal alloy design. Single-phase HEAs, nevertheless, suffer from the strength-ductility trade off as seen in conventional metallic materials. LÄS MER

  5. 9. Quantum-Mechanical Modeling of High-Entropy Alloys

    Författare :Shuo Huang; Levente Vitos; Yang Wang; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : High-entropy alloys (HEAs) consisting of multi-principal elements open up a near-infinite compositional space for materials design. Extensive attention has been put on HEAs, and interesting structural, physical and chemical properties are being continuously revealed. LÄS MER

  7. 10. Hunting Hydrogen : Structure-property relations in High Entropy Alloy-based metal hydrides

    Författare :Gustav Ek; Martin Sahlberg; Ulrich Häussermann; William I.F. David; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrogen; metal-hydride; High Entropy Alloy; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

    Sammanfattning : Metal hydrides have many uses when switching the energy system from fossil fuels to renewable sources, such as rechargeable batteries, hydrogen storage, hydrogen compression and thermal storage. State of the art materials for these applications such as LaNi5 and TiFe, however, suffer certain limitations such as degradation during repeated hydrogen cycling and harsh activation conditions for initial hydrogen uptake, promoting the need for novel materials. LÄS MER