Blar i NTNU Open på forfatter "Marthinsen, Knut"
-
The Effect of Alloying Elements on the Ductility of Al-Mg-Si Alloys
Remøe, Magnus Sætersdal (Master thesis, 2014)Experiments were conducted to attempt to understand the effect of different alloying elements on the ductility of Al-Mg-Si alloys. Four alloys with different concentrations of Si, Mg, Fe, Mn and Cu were selected for ... -
The effect of alloying elements on the ductility of Al-Mg-Si alloys
Remøe, Magnus Sætersdal; Marthinsen, Knut; Westermann, Ida; Pedersen, Ketill Olav; Røyset, Jostein; Marioara, Calin Daniel (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 ... -
The effect of cooling rate from solution heat treatment on ductility in Al-Mg-Si crash box alloys
Lesjø, Martin Bakken (Master thesis, 2022)Effekten på duktilitet av kjølehastighet fra innherding av Al-Mg-Si-legeringer er undersøkt. Tre forskjellige legeringer ble avkjølt med fire forskjellige kjølemetoder. Disse var kaldt vann, kokt vann, luft med konveksjon ... -
The Effect of Heating Rate on the Density and Spatial Distribution of Dispersoids during Homogenisation of 6xxx Aluminium Alloys
Remøe, Magnus Sætersdal; Marthinsen, Knut; Westermann, Ida; Pedersen, Ketill Olav; Røyset, Jostein; Reiso, Oddvin (Journal article; Peer reviewed, 2017) -
The effect of heavy deformation on the precipitation in an Al-1.3Cu-1.0Mg-0.4Si wt.% alloy
Thronsen, Elisabeth; Marioara, Calin Daniel; Sunde, Jonas Kristoffer; Minakuchi, Kazuhiro; Katsumi, Tetsuya; Erga, Iven; Andersen, Sigmund Jarle; Friis, Jesper; Marthinsen, Knut; Matsuda, Kenji; Holmestad, Randi (Journal article; Peer reviewed, 2020)This work has investigated the effect of the combination of natural ageing and 80% pre-deformation after solution heat treatment on precipitation during subsequent artificial ageing in an Al-1.3Cu-1.0Mg-0.4Si wt.% alloy. ... -
The effect of iron and the precipitation behavior of iron during annealing of a cold deformed commercial purity aluminium alloy
Bunkholt, Sindre; Nes, Erik Aasmund; Marthinsen, Knut (Journal article; Peer reviewed, 2017)Iron is always present in any aluminium alloy and usually as an impurity element. In commercial purity alloys the concentration of iron is typically so large that iron has a strong influence on the material properties, due ... -
The Effect of Solute Atoms on Grain Boundary Migration: A Solute Pinning Approach
Hersent, Emmanuel C; Marthinsen, Knut; Nes, Erik Aasmund (Journal article, 2013)The effect of solute atoms on grain boundary migration has been modeled on the basis of the idea that solute atoms will locally perturb the collective rearrangements of solvent atoms associated with boundary migration. The ... -
The effects of quench rate and pre-deformation on precipitation hardening in Al–Mg–Si alloys with different Cu amounts
Saito, Takeshi; Marioara, Calin Daniel; Røyset, Jostein; Marthinsen, Knut; Holmestad, Randi (Journal article, 2014)The effects of quench rate after solution heat treatment in combination with 1% pre-deformation on precipitation hardening in three Al–Mg–Si alloys have been investigated by transmission electron microscopy and hardness ... -
The Influence of Constituent Particles on Compression Properties and Fracture Initiation in Al Alloys
Bakken, Frank Oliver (Master thesis, 2013)In the present work an AlMgSi alloy, with a small amount of Fe has been investigated. The objective was to study how the thermomechanical processing influences the mechanical properties in compression, dependent on grain ... -
The influence of microchemistry on the softening behaviour of two cold-rolled Al-Mn-Fe-Si alloys
Huang, Ke; Wang, Ning; Li, Yanjun; Marthinsen, Knut (Journal article, 2014)The influence of microchemistry on the softening behaviour of two cold-rolled Al–Mn–Fe–Si alloys with different initial amounts of Mn (0.4 and 1.0 wt%) is studied. In addition to their as-cast conditions, the supersaturated ... -
The influence of processing conditions on microchemistry and the softening behavior of cold rolled Al-Mn-Fe-Si alloys
Wang, Ning; Huang, Ke; Li, Yanjun; Marthinsen, Knut (Journal article; Peer reviewed, 2016)Using different homogenization treatments, different initial microchemistry conditions in terms of solid solution levels of Mn, and number densities and sizes of constituents and dispersoids were achieved in an Al-Mn-Fe-Si ... -
The Influence of Transient Change in Strain Rate on Subgrain Size During Deformation by Torsion of AA6063
Rist, Pål (Master thesis, 2016)During hot extrusion a extrusion billet s cross section is reduced, altering the metals micro- structure. As the billet is passing through the extrusion die the strain rate and temperature increases, resulting in a with a ... -
Through thickness variations of deformation texture in round profile extrusions of 6063-type aluminium alloy: experiments, FEM and crystal plasticity modelling
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Aukrust, Trond; Segatori, Antonio (Journal article; Peer reviewed, 2018)The deformation texture and its through-thickness heterogeneity for an extruded round profile are experimentally measured by the electron back-scatter diffraction technique (EBSD), and numerically modelled by coupling FEM ... -
Through thickness variations of deformation texture in round profile extrusions of 6063-type aluminium alloy: Experiments, FEM and crystal plasticity modelling
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Aukrust, Trond; Segatori, Antonio (Journal article; Peer reviewed, 2018)The deformation texture and its through-thickness heterogeneity for an extruded round profile are experimentally measured by the electron back-scatter diffraction technique (EBSD), and numerically modelled by coupling FEM ... -
Twinnability of Al–Mg alloys: A first-principles interpretation
Zhao, Dongdong; Løvvik, Ole Martin; Marthinsen, Knut; Li, Yanjun (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 ... -
Work hardening and Portevin-Le Chatelier (PLC) effect in aluminium alloys
Sigvaldsen, Øystein Remmem (Master thesis, 2019)Bruk av enkelte Al-Mg-legeringer kan føre til utfordringer. Innenfor visse tøyningshastigheter og temperaturer kan det oppstå overflatefeil og tap av mekaniske egenskaper. Dette på grunn av Portevin-Le Chatelier-effekten. ... -
Work hardening and Portevin-Le Chatelier (PLC) effect in aluminium alloys
Sigvaldsen, Øystein Remmem (Master thesis, 2018)Mechanical testing and microstructure characterization of an AA5182 alloy is performed for use as input for calibration and further development of models for work hardening and dynamic strain aging effects. The experimental ...