Search for dissertations about: "atom probe tomography"

Showing result 11 - 15 of 45 swedish dissertations containing the words atom probe tomography.

2. 11. Microstructure of Carbon Fibres for Multifunctional Composites: 3D Distribution and Configuration of Atoms

   Author : Marcus Johansen; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multifunctional composites; microstructure; synchrotron hard X-ray photoelectron spectroscopy; carbon fibres; energy storage; atom probe tomography; heteroatoms;

   Abstract : Lightweight energy storage is a must for increased driving range of electric vehicles. “Mass-less” energy storage can be achieved by directly storing energy in structural components. READ MORE

4. 12. Experimental study of phase separation in Fe-Cr based alloys

   Author : Jing Zhou; John Ågren; Joakim Odqvist; Peter Hedström; Andersson Marcus; KTH; []
   Keywords : Duplex stainless steels; Ferritic stainless steels; Spinodal decomposition; Phase separation; Atom probe tomography; Clustering; Radial distribution function RDF ;

   Abstract : Duplex stainless steels (DSSs) are important engineering materials due to their combination of good mechanical properties and corrosion resistance. However, as a consequence of their ferrite content, DSSs are sensitive to the so-called ‘475°C embrittlement’, which is induced by phase separation, namely, the ferrite decomposed into Fe-rich ferrite (α) and Cr-rich ferrite (α'), respectively. READ MORE

5. 13. Thermodynamic and Kinetic Investigation of the Fe-Cr-Ni System Driven by Engineering Applications

   Author : Wei Xiong; Malin Selleby; John Ågren; Byeong-Joo Lee; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phase transformation; magnetism; spinodal decomposition; stainless steel; low temperature CALPHAD; phase field; ab initio; atom probe tomography; calorimetry; SRA - E-vetenskap SeRC ; SRA - E-Science SeRC ; SRA - Energy; SRA - Energi;

   Abstract : This work is a thermodynamic and kinetic study of the Fe-Cr-Ni system as the core of stainless steels. The Fe-Cr, Fe-Ni and Cr-Ni systems were studied intensively using both computational and experimental techniques, including CALPHAD (CALculation of PHAse Diagrams), phase field simulation, ab initio modeling, calorimetry, and atom probe tomography. READ MORE

6. 14. Evolution of WC-Co cemented carbide microstructure during creep testing

   Author : Mohamed Amine Yousfi; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; plastic deformation; cemented carbides; linear intercept; transmission electron microscopy.; electron backscattered diffraction; Atom probe tomography;

   Abstract : The aim of this work is to understand the mechanisms behind the plastic deformation of WC-­Co based cemented carbides. The microstructures of two materials have been investigated before and after creep deformation using quantitative microscopy, atom probe tomography, and transmission electron microscopy. READ MORE

7. 15. Nanostructuring and Age Hardening in TiSCN, ZrAlN, and TiAlN Thin Films

   Author : Lars Johnson; Lars Hultman; Axel Flink; Linköpings universitet; []
   Keywords : thin films; age hardening; spinodal decomposition; TiSiCN; ZrAlN; TiAlN; Transmission electron microscopy; Atom probe tomography; NATURAL SCIENCES; NATURVETENSKAP;

   Abstract : This thesis explores nanostructuring in TiSiCN, ZrAlN, and TiAlN thin films deposited by cathodic arc evaporation onto cemented carbide substrates, with intended applications for cutting tools. The three systems were found to exhibit age hardening upon annealing, by different mechanisms, into the superhard regime (≥30 GPa), as determined by a combination of electron microscopy, X-ray diffraction, atom probe tomography, erda, and nanoindentation tech- niques. READ MORE