Blar i NTNU Open på forfatter "Ånes, Håkon Wiik"
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Analyzing and improving open-source template matching for orientation mapping based on SPED data
Broussard, Joseph (Master thesis, 2022)Science has become and continues to be more reliant on fast, accurate, precise and understandable computational methods. Most scientific communities have been gravitating towards open source python packages, as python is ... -
Characterisation of photochromic oxygen-containing yttrium hydride by electron microscopy
Ånes, Håkon Wiik (Master thesis, 2017)Smart windows based on chromogenic materials have in recent years emerged as promising candidates for the next generation of energy-efficient windows. One group of chromogenic materials are photochromic, which are characterised ... -
Confinement-Driven Inverse Domain Scaling in Polycrystalline ErMnO3
Schultheiss, Jan; Xue, Fei; Roede, Erik Dobloug; Ånes, Håkon Wiik; Danmo, Frida Hemstad; Selbach, Sverre Magnus; Chen, Long-Qing; Meier, Dennis (Peer reviewed; Journal article, 2022)The research on topological phenomena in ferroelectric materials has revolutionized the way people understand polar order. Intriguing examples are polar skyrmions, vortex/anti-vortex structures, and ferroelectric ... -
Correlated subgrain and particle analysis of a recovered Al-Mn alloy by directly combining EBSD and backscatter electron imaging
Ånes, Håkon Wiik; Van Helvoort, Antonius; Marthinsen, Knut (Journal article, 2022)Correlated analysis of (sub)grains and particles in alloys is important to understand transformation processes and control material properties. A multimodal data fusion workflow directly combining subgrain data from electron ... -
Crystal Phase Mapping by Scanning Precession Electron Diffraction and Machine Learning Decomposition
Ånes, Håkon Wiik; Andersen, Ingrid Marie; Van Helvoort, Antonius (Journal article; Peer reviewed, 2018)Analyzing the distribution of crystal phases is required to understand nanostructures. Conventional analysis in the transmission electron microscope (TEM) include acquiring dark-field (DF) images for each expected crystal ... -
Effect of Sigma Phase in Wire Arc Additive Manufacturing of Superduplex Stainless Steel
Akselsen, Odd Magne; Bjørge, Ruben; Ånes, Håkon Wiik; Ren, Xiaobo; Nyhus, Bård (Peer reviewed; Journal article, 2021)In the present study, the thermal program in wire and arc additive manufacturing has been varied in terms of heat input and interpass temperature. Three walls were completed with subsequent Charpy V impact toughness and ... -
Effects of Mn content and cooling conditions in a rolled AA 3005A alloy
Vårli, Erling Aares (Master thesis, 2021)Sekundærproduksjon av aluminium innebærer omsmelting av aluminiumsskrap i tillegg til tilsetninger av primæraluminium og legeringselementer. Ettersom den kjemiske sammensetningen i skrapet varierer vil dette også føre til ... -
Effects of second-phase particles on texture during softening of an Al-Mn alloy investigated by correlative microscopy
Ånes, Håkon Wiik (Doctoral theses at NTNU;2024:48, Doctoral thesis, 2024)Aluminium is the second most used metal by weight after iron, and aluminium alloys are some of the most important structural light alloys. Motivated by reducing weight, energy, and cost, many manufacturers are replacing ... -
Evolution in Mechanical Behaviour in a Rolled 3xxx Aluminium Alloy during Lacquering
Underhaug, Kristine Meling (Master thesis, 2020)Arbeidet i denne masteroppgaven ble utført for å undersøke en mulig herdene effekt i plater av en 3xxx aluminium legering etter en lakkeringsprosess. Hensikten var å undersøke endringen i mekanisk adferd og hvordan materialet ... -
Free, flexible and fast: Orientation mapping using the multi-core and GPU-accelerated template matching capabilities in the Python-based open source 4D-STEM analysis toolbox Pyxem
Cautaerts, Niels; Crout, Phillip; Ånes, Håkon Wiik; Prestat, Eric; Jeong, Jiwon; Dehm, Gerhard; Liebscher, Christian H. (Peer reviewed; Journal article, 2022)This work presents the new template matching capabilities implemented in Pyxem, an open source Python library for analyzing four-dimensional scanning transmission electron microscopy (4D-STEM) data. Template matching is a ... -
Graphical User Interface Implementation for an Indexing Workflow of Electron Backscatter Diffraction Patterns
Natlandsmyr, Ole (Master thesis, 2021)Innen materialteknologi er det avgjørende å ha oversikt over materialenes innhold og struktur. En etablert teknikk er diffraksjon av tilbakespredte elektroner (EBSD – Electron Backscatter Diffraction) i elektronmikroskop. ... -
High resolution crystal orientation mapping of ultrathin films in SEM and TEM
Heinig, M. F.; Chatterjee, Dipanwita; Van Helvoort, Antonius; Wagner, Jakob B.; Kadkhodazadeh, S; Ånes, Håkon Wiik; Niessen, F; Bastos da Silva, A. (Peer reviewed; Journal article, 2022)Ultrathin metallic films are important functional materials for optical and microelectronic devices. Dedicated characterization with high spatial resolution and sufficient field of view is key to the understanding of the ... -
Improving Quantification of Sigma and Chi Phases in SDSS with EBSD
Østerhus, Vetle Runestad (Master thesis, 2020)Super duplex rustfrie stål (SDSS) blir på grunn av deres kombinasjon av høy korrosjonsmotstand og gode mekaniske egenskaper brukt i industrier hvor disse materialegenskapene er nødvendige, f.eks. i olje- og gassindustrien. ... -
In-situ observations of dislocation recovery and low angle boundary formation in deformed aluminium
Ånes, Håkon Wiik; Van Helvoort, Antonius; Marthinsen, Knut (Journal article; Peer reviewed, 2019)An experimental study of the recovery of dislocations and low angle boundary formation in aluminium is presented. By combining in-situ annealing with orientation mapping in the transmission electron microscope, maps of ... -
Intermetallic Phase Layers in Cold Metal Transfer Aluminium-Steel Welds with an Al–Si–Mn Filler Alloy
Bergh, Tina; Ånes, Håkon Wiik; Aune, Ragnhild; Wenner, Sigurd; Holmestad, Randi; Ren, Xiaobo; Vullum, Per Erik (Peer reviewed; Journal article, 2023) -
Microstructure and Properties of Wire Arc Additive Manufacturing of Inconel 625
Akselsen, Odd Magne; Bjørge, Ruben; Ånes, Håkon Wiik; Ren, Xiaobo; Nyhus, Bård (Journal article; Peer reviewed, 2022)In the present investigation, wire arc additive manufacturing of Inconel 625 was carried out with the cold metal transfer variant of the metal inert gas process. The heat input varied between 0.46 and 0.63 kJ/mm, which is ... -
Orientation and Projection Center Refinement for EBSD Indexing in Python
Lervik, Lars Andreas Hastad (Master thesis, 2021)I dette arbeidet er et sett med algoritmer for forbedring av krystallorientering og projeksjonssenter estimater spesielt etter, men ikke begrenset til, dictionary indexing av EBSD mønster presentert. Algoritmene er utviklet ... -
Orientation dependent pinning of (sub)grains by dispersoids during recovery and recrystallization in an Al–Mn alloy
Ånes, Håkon Wiik; Van Helvoort, Antonius; Marthinsen, Knut (Peer reviewed; Journal article, 2023)The recrystallized grain size and texture in alloys can be controlled via the microchemistry state during thermomechanical processing. The influence of concurrent precipitation on recovery and recrystallization is here ... -
Processing and indexing of electron backscatter patterns using open-source software
Ånes, Håkon Wiik; Hjelen, Jarle; Sørensen, Bjørn Eske; Van Helvoort, Antonius; Marthinsen, Knut (Peer reviewed; Journal article, 2020)A new method to increase the signal-to-noise ratio S/N of electron backscatter patterns (EBSPs) based upon principal component analysis (PCA) is presented. The PCA denoising method is applied to ten scans of EBSPs from the ...