Sökning: "high entropy alloy"

Visar resultat 1 - 5 av 29 avhandlingar innehållade orden high entropy alloy.

1. 1. Alloy Design and Optimization of Mechanical Properties of High-Entropy Alloys

   Författare :Saad Ahmed Sheikh; Chalmers University of Technology; []
   Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ductility; topologically closed-pack TCP and geometrically closed-pack GCP phase; alloy design; mechanical properties; High-entropy alloys; refractory high-entropy alloys; valence electron concentration;

   Sammanfattning : High-entropy alloys (HEAs) are described as alloys containing multi-principal elements in equal or close to equal atomic percentage. HEAs are considered as potential structural materials for high-temperature applications; where alloy design and optimization of mechanical properties is extremely critical. LÄS MER

3. 2. Refractory High-entropy Alloy and Nitride Thin Films

   Författare :Rui Shu; Per Eklund; Arnaud Le Febvrier; Alfred Ludwig; Linköpings universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; 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

4. 3. 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 :NATURAL SCIENCES; NATURVETENSKAP; 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

5. 4. Additive Manufacturing of Ferritic Materials : A Journey from Stainless Steels to High-Entropy Alloys

   Författare :Dennis Karlsson; Ulf Jansson; Martin Sahlberg; Eduard Hryha; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Additive Manufacturing; Laser Powder Bed Fusion; Binder Jetting; Ferritic Stainless Steel; High Entropy Alloy; Mechanical Properties;

   Sammanfattning : Design of new materials with complex geometries is an important part of new innovative solutions for technical applications. With the use of additive manufacturing (AM), the design possibilities are endless and geometries that are impossible to manufacture by conventional techniques are available. LÄS MER

7. 5. Synthesis and Tuning of Multifunctional Materials at High Pressure

   Författare :Lei Liu; Peter Lazor; Roland Mathieu; Guoyin Shen; Viktor Struzhkin; Ronald Miletich-Pawliczek; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; double perovskite; multiferroic; bandgap engineering; high-entropy alloy; high pressure; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

   Sammanfattning : At the present stage, human society is developing at an unprecedented speed, facing an emergence of highly pressing challenges, e.g., information explosion, energy production problems, environmental pollution, climate problems. Functional materials with tailored properties are considered as holding a key to solving these problems. LÄS MER