Search for dissertations about: "high entropy refractory alloy"

Showing result 1 - 5 of 10 swedish dissertations containing the words high entropy refractory alloy.

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

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

   Abstract : 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. READ MORE

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

   Author : Saad Ahmed Sheikh; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; 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;

   Abstract : 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. READ MORE

5. 3. Microstructure and Mechanical Properties of Plasma Atomized Refractory Alloys

   Author : Marina Ciurans Oset; Farid Akhtar; Johanne Mouzon; Dariusz Jarzabek; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; plasma atomization; spherical powder; tungsten carbide; high entropy alloy; refractory; Engineering Materials; Materialteknik;

   Abstract : Plasma centrifugal atomization is a method widely used in the production of spherical powders of metals and alloys with relatively low melting points. A novel plasma centrifugal atomization process suitable for high melting point materials (i.e. 3500 ᵒC and above) was developed by Metasphere Technology AB, currently Höganäs Sweden AB. READ MORE

6. 4. Refractory High Entropy Alloys and Films for High Temperature Applications

   Author : Sajid Ali Alvi; Farid Akhtar; Marta-Lena Antti; Ulf Jansson; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik;

   Abstract : High-entropy alloy (HEA) is a multi-component alloy constituting five or more principal elements in equi- or near equi-atomic percentages. The high configurational entropy in a HEA composition, in contrast to conventional alloys, leads to the stabilisation of the alloying elements in stable solid solutions of face-centred-cubic (FCC), body-centred-cubic (BCC) and/or amorphous structures. READ MORE

7. 5. Alloy Design for Refractory High Entropy Alloys with Better Balanced Mechanical Properties at Both Room Temperature and Elevated Temperatures

   Author : Xiaolong Li; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high temperature strength; temperature dependence of yield stress; room temperature ductility; substitutional solid solutions; oxidation resistance.; solid solution softening and hardening; Refractory high-entropy alloys RHEAs ;

   Abstract : Motivated by the desire to improve the energy efficiency of gas turbines by operating them at higher temperatures (HT), which will contribute to a more energy efficient and carbonless society, the quest for novel ultrahigh-temperature materials can never be overwhelming. High entropy alloys, the recently emerged multi-component alloys with equiatomic or close-to-equiatomic compositions, are considered highly promising as next-generation ultrahigh-temperature materials. READ MORE