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Microstructural evolution of 3000 series multi-port extruded tubes during brazing cycles
(Master thesis, 2017)The AA3xxx series alloys are known for the good corrosion resistance and widely used as heat exchanging material. However, 3xxx series alloys shows intergranular corrosion problem after brazing. In this project, a systematic ... -
Aspects related to the thermal and mechanical stability of oxygen permeable membranes
(Doctoral theses at NTNU;2017:59, Doctoral thesis, 2017)Fossil fuels causes CO2 emission to the atmosphere after combustion, and to minimize CO2 emission carbon capture and sequestration (CCS) technologies are under development. CCS involves CO2 capture, compression, transport ... -
Effects of Surface Treatment on Hypoeutectoid Steels and Commercially Pure Copper in a Compound Casting Process with Aluminum A356 Alloy
(Master thesis, 2017)Evidence of climate change has caused industries worldwide to start measures towards reducing greenhouse gas emission. The automotive industry is a large contributor to emission and has therefore demanded production of ... -
Manufacturing of perovskite oxygen carriers by spray granulation for chemical looping combustion
(Journal article; Peer reviewed, 2017)Chemical looping combustion is a technology under development that allows power production with inherent separation of CO2 during fuel combustion. Its principle relies on oxygen carrier materials transporting oxygen from ... -
Experimental and numerical modelling study on the nucleation and grain growth of inoculated aluminium alloys
(Doctoral theses at NTNU;2017:343, Doctoral thesis, 2017)With the aim to achieve an in-depth understanding on the heterogeneous nucleation and grain growth behavior during solidification of inoculated aluminum alloys, an integrated study by in-situ X-radiography, numerical ... -
Electrodeposition mechanism of ZnSe thin film in aqueous solution
(Journal article, 2017)ZnSe is one of the important and excellent II–VI semiconductor materials, which has direct transition band structure. In this paper, ZnSe thin films were prepared by an electrochemical deposition method, and the formation ... -
Briquetting of Manganese Oxide Fines with Organic Binders - How well suited are organic binders for agglomeration of Mn-oxide fines?
(Master thesis, 2017)Dust and fines are created throughout the ferromanganese metal production. These fines are collected from ventilation filters, screening operations and off-gas cleaning facilities. As the fines contain a substantial amount ... -
Global formation of topological defects in the multiferroic hexagonal manganites
(Journal article; Peer reviewed, 2017)The spontaneous transformations associated with symmetry-breaking phase transitions generate domain structures and defects that may be topological in nature. The formation of these defects can be described according to the ... -
Combined effect of Mg and vacancy on the generalized planar fault energy of Al
(Journal article; Peer reviewed, 2017)By first-principles calculations, a systematic study has been undertaken to investigate the combined effect of vacancies and Mg impurities on the generalized planar fault energy (GPFE) of pure Al. It was predicted that ... -
Twinnability of Al–Mg alloys: A first-principles interpretation
(Journal article; Peer reviewed, 2017)Al–Mg alloys are considered to have potentials to form twins during deformation because Mg can reduce the intrinsic stacking fault energy γISFE of Al. Nevertheless, twinning has rarely been found in Al–Mg alloys even ... -
Lattice thermal conductivity of TixZryHf1−x−yNiSn half-Heusler alloys calculated from first principles: Key role of nature of phonon modes
(Journal article; Peer reviewed, 2017)In spite of their relatively high lattice thermal conductivity κℓ, the XNiSn (X=Ti, Zr, or Hf) half-Heusler compounds are good thermoelectric materials. Previous studies have shown that κℓ can be reduced by sublattice ... -
Cryogenic temperature deformation behaviour of two Al-Mg-Si alloys
(Doctoral theses at NTNU;2017:11, Doctoral thesis, 2017)A comprehensive study was carried out to clarify the effects of cryogenic temperature on mechanical properties and microstructure of two peak-aged Al-Mg-Si profiles, i.e., fully recrystallized AA6060 and fibrous AA6082. ... -
Thermomechanical processing of an AA6082 - IF steel cold roll bonded composite material
(Master thesis, 2017)The work carried out in this thesis was conducted to investigate thermomechanical aspects of a steel-aluminum cold roll bonded material. The objective was to study different production parameters related to ageing of an ... -
The effect of alloying elements on the ductility of Al-Mg-Si alloys
(Journal article; Peer reviewed, 2017)Experiments were conducted to document the combined effect of different alloying elements on the microstructure and associated stress-strain behavior of extruded Al-Mg-Si alloys, with a special emphasis on the ductility ... -
Hydrometallurgical Purification of Magnesium-Doped Silicon by Different Acids
(Chapter, 2017)The purification of commercial metallurgical grade silicon through alloying and then acid leaching is studied. Magnesium is added into molten silicon and then acid leaching of the solidified Si-Mg alloy by HCl, H2SO4 and ... -
SiC production using SiO 2 and Cagglomerates
(Doctoral theses at NTNU;2017:180, Doctoral thesis, 2017)Due to the possible shortage of high-quality fossil carbon materials and charcoal for the Si industry, this study will focus on the possibility of using natural gas as the substitute of commercially scarce high quality ... -
Experimental investigation and modelling of strain-path changes in metals
(Doctoral theses at NTNU;2017:287, Doctoral thesis, 2017) -
PFC Evolution in the Aluminium Production Process
(Doctoral theses at NTNU;2017:137, Doctoral thesis, 2017)Improvements in the Hall-Héroult process for electrowinning of aluminium have drastically reduced the anode effect duration, frequency and its associated perfluorocarbon (PFC) evolution, especially over the past 50 years. ... -
Purification of Silicon Through a Hydrometallurgical Process
(Master thesis, 2017)The demand for cleaner energy is rising because of the global warming and because of the access of fossil energy one day will come to an end. For encounter this demand, solar cells have a huge potential. Today the market ... -
Functional electronic inversion layers at ferroelectric domain walls
(Journal article; Peer reviewed, 2017)Ferroelectric domain walls hold great promise as functional two-dimensional materials because of their unusual electronic properties. Particularly intriguing are the so-called charged walls where a polarity mismatch causes ...