Sökning: "substitutional elements"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden substitutional elements.

1. 1. Atom-probe microanalysis of cermets

   Författare :Ulf Rolander; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; field evaporation; substitutional elements; interstitial elements; ion microscopy; carbonitrade grains;

   Sammanfattning : .... LÄS MER

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

   Författare :Xiaolong Li; Chalmers tekniska högskola; []
   Nyckelord :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 ;

   Sammanfattning : 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. LÄS MER

4. 3. Thermodynamic and kinetic investigation of systems related to lightweight steels

   Författare :Weisen Zheng; Malin Selleby; Tomás Gómez-Acebo; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fe-Mn-Al-C; CALPHAD; MGI; ICME; Precipitation strengthening; Lightweight steels.; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Lightweight steels have attracted considerable interest for automobile applications due to the weight reduction without loss of high strength and with retained excellent plasticity. In austenitic Fe-Mn-Al-C steels, the nano-precipitation of the κ-carbide within the austenitic matrix significantly contributes to the increase in yield strength. LÄS MER

5. 4. Carbides in martensitic medium carbon low alloyed tool steels studied with small angle scattering techniques, electron microscopy and atom probe tomography

   Författare :Erik Claesson; Peter Hedström; Hans Magnusson; Erik Offerman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Low alloyed tool steel; Martensite; Small angle scattering; Scanning transmission electron microscopy; Energy dispersive x-ray spectroscopy; atom probe tomography; Scanning precession electron diffraction; Precipitation; carbides; Tempering.; Materials Science and Engineering; Teknisk materialvetenskap;

   Sammanfattning : Medium carbon low alloyed tool steels are used today in various areas to shape plastics, nonferrous metals, and steels, and they are crucial in the manufacturing industry. To be effective, tool steels must be strong and tough, and have high wear resistance and temperature stability. LÄS MER

7. 5. Thin Film Synthesis and Characterization of New MAX Phase Alloys

   Författare :Aurelija Mockutė; Johanna Rosén; Lars Hultman; György Radnóczi; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : The objective of this Thesis is synthesis and characterization of new MAX phase alloys (M = early transition metal, A = A-group element, and X = C or N) based on incorporation of M and X elements previously not used in any known MAX phases. This is motivated by a search for optimized and unique materials properties, such as different magnetic states. LÄS MER