Blar i Institutt for materialteknologi på tittel
Viser treff 2114-2133 av 2527
-
Strålingspåvirkning på optiske element for en Hyperspektral CubeSat-nyttelast
(Bachelor thesis, 2019)NTNU SmallSat Lab har som mål å bygge en billig og høy ytelse hyperspectral-kamera for å oppdage alge og plankton signaturer fra rommet. Kameraet er laget av optiske COTS komponenter. Det er imidlertid velkjent innen romfart ... -
Strength and Ductility in two Ultra High Strength Al-Alloys AA2196 and AA7090
(Master thesis, 2019)I denne masteroppgaven blir de mekaniske egenskapene, kornstrukturen og anisotropien i tredjegenerasjons Al-Li legeringen AA2196 undersøkt etter en foreslått varmebehandlingsprosess. Hensikten med rapporten er å undersøke ... -
Strength contributions from precipitates
(Journal article; Peer reviewed, 2015)A theory for the strength contribution from precipitates is developed based on the statistical particle-size and shape distributions and the corresponding obstacle strengths. The generic case of spherical precipitates and ... -
Strengthening and toughening mechanisms of an ultrafine grained Mg-Gd-Y-Zr alloy processed by cyclic extrusion and compression
(Journal article; Peer reviewed, 2017)Cyclic extrusion and compression (CEC) was implemented to process the Mg-Gd-Y-Zr alloy. Microstructure characters, including the matrix grain, precipitates and texture evolution, were tried to correlate with the mechanical ... -
Stress corrections after necking using a two-parameter equation for the radius of curvature
(Peer reviewed; Journal article, 2021)Uniaxial tensile tests were conducted at room temperature, 100 °C and 150 °C, for obtaining necking-corrected stress–strain curves until fracture. The necking correction is based on specimen contours estimated from images ... -
Stress Corrosion Cracking of Carbon Steel in Amine Solution
(Master thesis, 2019)I denne oppgaven undersøkes muligheten for spenningskorrosjon og andre sprøbruddsmekanismer i et S235JR stål i en løsning av 30% monoetanolamin. Strekktesting ved lav tøyningshastighet ble foretatt med to og to prøver i ... -
Stress Induced Problems in Himalayan Tunnels with Special Reference to Squeezing
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:20, Doctoral thesis, 2006)There is a huge potential of underground constructions in the Himalayan region for hydropower, transport systems and conservation of environment. However, the tectonic activities have resulted with a fragile regional ... -
Stress-strain relations for age hardened AlMgSi alloys, measured with necking corrections and modelled based on TEM characterization
(Doctoral theses at NTNU;2021:182, Doctoral thesis, 2021)Age hardening Al-Mg-Si(-Cu) alloys, like other aluminium alloys, are increasingly utilized due to the combination of cost-saving, easy fabrication, and good mechanical properties. Yield strength and work hardening are ... -
Structural and chemical stability of the hexagonal manganites
(Doctoral theses at NTNU;2017:252, Doctoral thesis, 2017)The link between atomic interactions and functional properties in the fascinating material system called hexagonal manganites is investigated in this thesis. By using both neutron scattering measurements and first principles ... -
Structural and electrochemical characterization of graphite materials for Li ion batteries
(Master thesis, 2012)The purpose of this study is to find a correlation between the crystallite sizes in thebasal plane direction of graphite materials, used in carbon anodes in Lithium-ionbatteries. Carbon anodes are the most common type of ... -
Structural Characterization of Natural Quartz by Scanning TEM
(Journal article; Peer reviewed, 2018)For quartz, despite its industrial importance and an extensive amount of research done on it, there are still open fundamental questions, e.g. regarding crystal defects, phase changes or damage mechanisms under ionizing ... -
Structural Disorder and Coherence across the Phase Transitions of Lead-Free Piezoelectric Bi0.5K0.5TiO3
(Journal article; Peer reviewed, 2018)Relaxor ferroelectrics exhibit superior properties for converting mechanical energy into electrical energy, and vice versa, but the structural disorder hampers an understanding of structure–property relationships and impedes ... -
Structural Dynamics Study of Hydration Shells on n-Ge(100) in Aqueous Solution with Electrochemical Control
(Chapter, 2016)Structural changes of the hydration shell of surfaces in aqueous solution are studied using attenuated total reflection infrared spectroscopy, under different electrode potentials and consequently different states of the ... -
Structural Evolution of Ferroelectric and Ferroelastic Barium Sodium Niobate Tungsten Bronze
(Peer reviewed; Journal article, 2020)The crystal structure of the ferroelastic and ferroelectric tungsten bronze Ba2NaNb5O15 (BNN) has been debated. Here, we re-examine the crystal structure of BNN by ambient powder X-ray diffraction combined with density ... -
Structural Evolution of Ferroelectric and Ferroelastic Barium Sodium Niobate Tungsten Bronze
(Peer reviewed; Journal article, 2020)The crystal structure of the ferroelastic and ferroelectric tungsten bronze Ba2NaNb5O15 (BNN) has been debated. Here, we re-examine the crystal structure of BNN by ambient powder X-ray diffraction combined with density ... -
Structural evolution of water and hydroxyl groups during thermal, mechanical and chemical treatment of high purity natural quartz
(Peer reviewed; Journal article, 2020)Fused silica crucibles are commonly used in the fabrication process of solar grade silicon ingots. These crucibles are manufactured from high purity natural quartz sand and as a consequence, their properties are influenced ... -
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. ... -
Structure and phase transitions in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) from -100 degrees C to 150 degrees C
(Journal article; Peer reviewed, 2013)The solid solution of (x)Ba0.7Ca0.3TiO3-(1-x)BaZr0.2Ti0.8O3 is known to exhibit high piezoelectric constants. Discrepancies in the reported phase transitions and structure around room temperature, however, have complicated ... -
Structure and phase transitions of A2MBr4 supramolecular crystals where A=[N(CH3)4] and/or [N(C2H5)4] and M= Zn or Mn
(Master thesis, 2021)Behovet for mindre, mer bærekraftige og elastiske elektriske innretninger har økt interessen for å finne erstatninger for konvensjonelle ferroelektriske materialene som ofte er sprø og har en lite energieffektiv produksjon. ... -
Structure Control of Multicrystalline Silicon
(Doctoral thesis at NTNU;2016:65, Doctoral thesis, 2016)This work targets multiple approaches for controlling the initial growth conditions of directional solidification, and their effect on the final material microstructure and performance. Challenges related to both seeded ...