Blar i NTNU Open på forfatter "Marthinsen, Knut"
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Interfacial and strain energy analysis from ab initio based hierarchical multi-scale modelling: the Al–Mg–Si alloy β'' phase
Ehlers, Flemming J H; Dumoulin, Stephane; Marthinsen, Knut; Holmestad, Randi (Journal article, 2014)Precipitate-host lattice interface studies have not traditionally been viewed as requiring hybrid model schemes for accurate determination of the interfacial and strain energies. On the other hand, the interfaces of main ... -
Isothermal and non-isothermal annealing of cold-rolled Al-Mn-Fe-Si alloys with different microchemistry states
Huang, Ke; Li, Yanjun; Marthinsen, Knut (Journal article, 2014)Investigation of the microstructural evolution of Al-Mn-Fe-Si alloys during annealing after cold rolling has been carried out. The effect of microchemistry state in terms of Mn in solid solution, constituents, size and ... -
Isothermal annealing of cold-rolled Al−Mn−Fe−Si alloy with different microchemistry states
Huang, Ke; Li, Yanjun; Marthinsen, Knut (Journal article, 2014)Microstructural evolution of a cold-rolled Al–Mn–Fe–Si alloy during annealing was studied. Except the as-cast variant, two other different homogenizations were considered, one gave a high density of fine dispersiods providing ... -
Lattice rotations in precipitate free zones in an Al-Mg-Si alloy
Christiansen, Emil; Marioara, Calin Daniel; Marthinsen, Knut; Hopperstad, Odd Sture; Holmestad, Randi (Journal article; Peer reviewed, 2018)Scanning precession electron diffraction and automated crystal orientation mapping in a transmission electron microscope (TEM) have been applied to quantitatively study the crystal orientation of precipitate free zones ... -
The Mechanical Properties During Thermomechanical Treatment of an Al-Cu-Mg-Si Alloy Intended for Zippers.
Erga, Iven (Master thesis, 2018)The objective of this project has been to find a suitable thermomechanical treatment for an Al- Cu-Mg-Si alloy. The aluminium alloy is to be used in zippers, produced by YKK, for jeans. The composition of the alloy is 1,25 ... -
Microstructural evolution during isothermal annealing of a cold-rolled Al-Mn-Fe-Si alloy with different microchemistry states
Huang, Ke; Li, Yanjun; Marthinsen, Knut (Journal article, 2014)In this paper, investigations of the softening behaviour of a supersaturated Al-Mn-Fe-Si alloy during annealing after cold rolling have been carried out. Two different homogenization conditions were considered, of which ... -
Microstructure And Properties Of Extruded Al-Alloys For Crash Components In Cars
Jensen, Nils Nortier (Master thesis, 2014)The demand for lightweight materials in the transport industry is fuelling the research of high performing components. Extruded aluminium profiles intended for crash components are examined in this project. The objective ... -
Microstructure Evolution and Recrystallization Resistance of a 7055 Alloy Fabricated by Spray Forming Technology and by Conventional Ingot Metallurgy
Xie, Zhiqiang; Jia, Zhihong; Xiang, Kaiyun; Kong, Yaping; Li, Zhenguo; Fan, Xi; Ma, Wantai; Zhang, Hao; Lin, Lin; Marthinsen, Knut; Liu, Qing (Peer reviewed; Journal article, 2020)The effect of different fabricating processes (spray forming and conventional casting) and homogenization treatment on the microstructure of an 7055 alloy was investigated by optical microscopy (OM), scanning electron ... -
Mikrostruktur og egenskaper under tilbakegløding av en kaldvalset Al-Mn-Mg legering
Hamnes, Eirik Bugten (Master thesis, 2019)Arbeidet utført i denne masteroppgaven ble gjort for å undersøke tilbakeglødingsresponsen til en ikke utherdbar Al-Mn-Mg type legering. Hovedmålet med oppgaven var å undersøke hvordan forskjellige prosessbetingelser og ... -
Modeling of Recrystallization of Commercial Particle Containing Al-Alloys
Marthinsen, Knut; Huang, Ke; Wang, Ning (Chapter, 2020)In order to describe and discuss the recrystallization behavior of commercial particle containing Al-alloys, the physical basis and a mathematical formulation of a softening model nicknamed ALSOFT, accounting for the ... -
Modelling Grain Growth with the Phase Field Method
Ødegaard, Magnus Høiberg (Master thesis, 2019)Kornvekst i et metall innebærer at kornene, volumer med atomer med samme orientering av krystallstrukturen, vokser og absorberer mindre korn, hvilket resulterer i en mer grovkornet struktur. Å forstå denne prosessen er ... -
Modelling microstructure and properties during annealing of coldrolled Al-Mn-Fe-Si-alloys with different microchemistries
Marthinsen, Knut; Wang, Ning; Huang, Ke (Journal article, 2014)The physical basis and a mathematical formulation of a softening model nicknamed Alsoft, accounting for the combined effect of recovery and recrystallization during annealing of heavily deformed aluminium alloys have been ... -
Modelling the evolution in microchemistry and its effects on the softening behavior of cold rolled AlFeMnSi-alloys during annealing
Hersent, Emmanuel C; Huang, Ke; Friis, Jesper; Marthinsen, Knut (Journal article, 2013)A dedicated diffusion controlled precipitation model for AlMnFeSi-alloys, based on classical nucleation and growth theory, has been implemented and coupled to a phenomenological softening model accounting for the combined ... -
Modelling time-dependent nucleation of recrystallization in aluminium alloys
Marthinsen, Knut; Friis, Jesper; Engler, Olaf (Journal article; Peer reviewed, 2013)The basic equations and mathematical framework of a mean-field model for recovery and recrystallization, the latter based on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) approach, capable of handling time-dependent nucleation ... -
Modified embedded atom method potential for Fe-Al intermetallics mechanical strength: A comparative analysis of atomistic simulations
Khalid, Muhammad Zeeshan; Friis, Jesper; Ninive, Per Harald; Marthinsen, Knut; Ringdalen, Inga Gudem; Strandlie, Are (Peer reviewed; Journal article, 2021)The structural and mechanical properties of Fe-Al compounds (FeAl, FeAl, FeAl, FeAl, FeAl, FeAl) have been studied using modified embedded atom method (MEAM) potentials. The equilibrium lattice constants, formation enthalpies, ... -
Numerisk modellering av tilbakeglødingsoppførsel i utvalgte aluminiumslegeringer
Reiten, Mads (Master thesis, 2011)I denne rapporten er det tatt for seg modellering av mykningsreaksjoner etter deformasjon for AA1200- og AA3103-legeringer. Grunnleggende teori rundt mykningsreaksjonene for disse legeringene er presentert. Det er hentet ... -
On the Effect of Atoms in Solid Solution on Grain Growth Kinetics
Hersent, Emmanuel C; Marthinsen, Knut; Nes, Erik Aasmund (Journal article; Peer reviewed, 2014)The discrepancy between the classical grain growth law in high purity metals (grain size D∝t1/2D∝t1/2) and experimental measurements has long been a subject of debate. It is generally believed that a time growth exponent ... -
On the spatio-temporal characteristics of the Portevin-Le Chatelier effect in aluminium alloy AA5182: An experimental and numerical study
Xu, Jianbin; Hopperstad, Odd Sture; Holmedal, Bjørn; Berstad, Torodd; Manik, Tomas; Marthinsen, Knut (Peer reviewed; Journal article, 2023)The Portevin–Le Chatelier (PLC) effect and its spatio-temporal characteristics in the aluminium alloy AA5182 are studied experimentally and numerically in the current work. An extremely high-frequency camera (up to 1000 ... -
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 ... -
Orientation independent and dependent subgrain growth during iso-thermal annealing of high- purity and commercial purity aluminium
Bunkholt, Sindre; Nes, Erik; Marthinsen, Knut (Journal article; Peer reviewed, 2019)The orientation dependence on recovery has been studied in cold-rolled and annealed polycrystalline high-purity aluminium (99.99 wt%), binary Al-0.25Mn and commercial purity aluminium. The growth mechanisms were found to ...