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Influence of impurity elements on the precipitation behaviour of dispersoids and their hardening effects in aluminium alloys
(Master thesis, 2017)Three different types of alloys have been investigated with respect to hardness, conductivity, strength and microstructural analysis using SEM and TEM. -
Effects of three metal coupling on galvanic crevice corrosion
(Master thesis, 2017)The subsea industry is moving its operations down onto the seabed. With this new direction in production solutions a larger emphasis is placed on reducing the weight of the components in the production unit. Finding ... -
Low Cycle Fatigue of Extruded and Cast Aluminium Alloy 6082
(Master thesis, 2017)The objective of the research is to determine the differences between the low cycle fatigue properties of an extruded and cast treatments of AA6082-T6 used as the forging billet in the production of a car suspension arm. ... -
Pyrometallurgical Treatment of Apatite Concentrate with the Objective of Rare Earth Element Recovery: Part II
(Journal article, 2017)Apatite, Ca5(PO4)3F, is a useful raw material for the production of both elemental phosphorus and phosphoric acid, and the mine tailings present at Luossavaara-Kiirunavaara AB (LKAB) in Kiruna, Sweden, represent a significant ... -
Microstructural Stability of Tailored CaMn0.875−xFexTi0.125O3−δ Perovskite Oxygen Carrier Materials for Chemical Looping Combustion
(Journal article; Peer reviewed, 2017)CaMn1−xTixO3−δ are state-of-the-art perovskite-type oxygen-carrier materials (OCMs) used in gaseous fluidized-bed chemical looping combustion (CLC), which is currently undergoing upscaling and demo campaigns in several ... -
Structure and Optical Properties of Titania-PDMS Hybrid Nanocomposites Prepared by In Situ Non-Aqueous Synthesis
(Journal article; Peer reviewed, 2017)Organic-inorganic hybrid materials are attractive due to the combination of properties from the two distinct types of materials. In this work, transparent titania-polydimethylsiloxane hybrid materials with up to 15.5 vol. ... -
Electroplating of Stainless Steel in Aqueous Alkaline Solution
(Master thesis, 2017)Electroplated stainless steel alloys containing elements such as iron, chromium and nickel, are of great interest in production of electronics and nanotechnology devices. Previous methods for electroplating of these alloys ... -
Study of Piezoelectric and Mechanical Properties of Porous Barium Titanate Ceramics for Biomedical Applications
(Master thesis, 2017)Throughout the last decades, the development of bioactive materials to be used as bone implants has been a very active research area. The number of surgeries related to bone implants are steadily increasing, such that ... -
High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures
(Journal article, 2017)Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale ... -
Role of molybdenum in corrosion of iron-based alloys in contact with hydrogen sulfide containing solution.
(Journal article; Peer reviewed, 2017)A sample iron molybdenum alloy with 3.4 wt% (2 at%) molybdenum, and pure iron, are exposed to hydrogen sulfide saturated saline solution for up to 56 days. In addition, their behavior under anodic polarization in the same ... -
Effect of coating density on oxidation resistance and Cr vaporization from solid oxide fuel cell interconnects
(Journal article; Peer reviewed, 2017)Manganese cobalt spinel oxides are promising materials for protective coatings for solid oxide fuel cell (SOFC) interconnects. To achieve high density such coatings are often sintered in a two-step procedure, involving ... -
Pyrometallurgical Treatment of Apatite Concentrate with the Objective of Rare Earth Element Extraction: Part I
(Journal article, 2017)Apatite, Ca5(PO4)3F, concentrate from LKAB in Kiruna, Sweden, has been characterized and pyrometallurgically treated using (i) silicon metal and fluxes to extract phosphorus and transition metals at 1600 °C (Part I ... -
Colloid-probe AFM studies of the surface functionality and adsorbed proteins on binary colloidal crystal layers
(Journal article; Peer reviewed, 2017)Colloid-probe-AFM has been widely used to measure the forces of interaction between two surfaces such as particles of different size and functionality or a flat surface and a particle in aqueous environments. However, the ... -
Pitting Corrosion of Super Duplex Stainless Steel - Effect of Tungsten and Isothermal Heat Treatments
(Master thesis, 2017)Duplex stainless steels (DSS) and super duplex stainless steels (SDSS) can be described as austenitic-ferritic stainless steels with a chromium content of 22 and 25 %, respectively. Because of their good combination of ... -
Boron Removal from Silicon by Moisturized Gases
(Chapter, 2017)The photovoltaic (PV) industry is in rapid growth and a large supply of PV feedstock materials must be provided to maintain this growth. Since silicon is still the dominant material for the fabrication of solar cells, ... -
Electrodeposition of zinc from acidic electrolyte
(Master thesis, 2017)Industrial zinc electrowinning is carried out in an aqueous solution of zinc sulfate in sulfuric acid. The anodes are made of a lead-silver alloy and the cathodes are made of a relatively pure aluminium alloy. A common ... -
Effect of current density, electrolyte composition and temperature on hot alternating current anodising
(Master thesis, 2017)Hot alternating current (AC) anodising has been established as a fast and reliable pre-treatment process for continuous coil coating. Hydro Aluminium Rolled Products AS (HARP) uses this process as a surface treatment before ... -
Impurity segregation at defects in Al and Si -A theoretical DFT based study
(Doctoral theses at NTNU;2017:273, Doctoral thesis, 2017)Alien impurity elements favor to stay at the defects, e.g. stacking fault, grain boundary (GB) in host materials and thus influence many material properties. On basis of atomistic simulations, the present thesis puts a ... -
Corrosion Fatigue of Extruded AA6082 Aluminium Alloy - The effects of Surface Roughness: Machined, Punched, and Counter Trimmed Surfaces
(Master thesis, 2017)The aim of this master s thesis is to investigate the corrosion fatigue properties of an extruded AA6082 alloy. Surface roughness deeply affects fatigue and corrosion fatigue. Surface roughness depends on the shaping ... -
The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy
(Journal article; Peer reviewed, 2017)An Al-5 wt.% Cu alloy supersaturated with Cu in solid solution was subjected to equal channel angular pressing (ECAP). The microstructural evolution was systematically investigated by backscattered electron (BSE) imaging, ...