Browsing NTNU Open by Author "Marthinsen, Knut"
Now showing items 1-20 of 74
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A First-Principles Study of the Al (001)/Fe(0-11) Interface
Khalid, Muhammad Zeeshan; Friis, Jesper; Ninive, Per Harald; Marthinsen, Knut; Strandlie, Are (Journal article; Peer reviewed, 2018)Two phase Stefan problem was solved using analytical method in cylindrical domain. To solve governing equations Eigen conditions were formulated by using separation of variable technique. Eigenvalues of the eigencondition ... -
A methodology to assess the spatial distribution of dispersoids in AL-MG-Si alloys
Marthinsen, Knut; Westermann, Ida; Remøe, Magnus Sætersdal (Chapter, 2018)Al-Mg-Si alloys often add small additions of e.g. Mn or Cr, to form dispersoids, which may act as nucleation sites for Mg2Si particles after homogenization. The purpose is to ensure a high density of uniformly distributed ... -
A methodology to assess the spatial distribution of dispersoids in Al-Mg-Si alloys
Remøe, Magnus Sætersdal; Westermann, Ida; Marthinsen, Knut (Chapter, 2018)Al-Mg-Si alloys often add small additions of e.g. Mn or Cr, to form dispersoids, which may act as nucleation sites for Mg2Si particles after homogenization. The purpose is to ensure a high density of uniformly distributed ... -
A Solute Pinning Approach to Solute Drag in Multi-Component Solid Solution Alloys
Hersent, Emmanuel C; Marthinsen, Knut; Nes, Erik Aasmund (Journal article; Peer reviewed, 2014)The Cahn, Lücke and Stüwe theory remains the backbone of more complex analysis dealing with solute drag, however, the mathematical treatment is rather involved. A new approach based on solute pinning the boundary has ... -
Ab-initio study of atomic structure and mechanical behaviour of Al / Fe intermetallic interfaces
Khalid, Muhammad Zeeshan; Friis, Jesper; Ninive, Per Harald; Marthinsen, Knut; Strandlie, Are (Journal article; Peer reviewed, 2020)First-principles virtual tensile and shear test calculations have been performed to Al(0 0 )//-AlFeSi(0 0 1) and Al(0 4)//Fe4Al13(1 0 ) interfaces by the ab initio pseudo potential density functional theory method. Work ... -
Al-5Cu alloy processed by equal-channel angular pressing
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)An ECAP (equal channel angular pressing) processed UFG Al-5Cu alloy was characterized by electron backscatter diffraction (EBSD). It is revealed that a bimodal grain structure, i.e. ultrafine grains accompanied by micron-sized ... -
Characterization and Modelling of the Microstructure and Texture Evolution In AlMgSi-Extrusions
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Friis, Jesper; Pettersen, Tanja; Segatori, Antonio (Journal article, 2017)The properties and surface appearance of aluminium extrusion are critically dependent on the microstructure and texture of the extruded profiles, and the requirements with respect to these aspects may vary with applications. ... -
Characterization of precipitates at maximum hardness and overaged conditions in Al-Mg-Si alloys
Småbråten, Halfdan Kristoffer (Master thesis, 2011)A study of the influence of artificial ageing temperature on the precipitation behaviour in three distinct direct chill casted and extruded Al-Mg-Si alloys has been carried out. The total amount of alloying elements is ... -
Characterization of the Density and Spatial Distribution of Dispersoids in Al-Mg-Si Alloys
Remøe, Magnus Sætersdal; Westermann, Ida; Marthinsen, Knut (Journal article; Peer reviewed, 2019)Al-Mg-Si alloys often contain small additions of, for example, Mn or Cr, to form dispersoids, which may act as nucleation sites for Mg2Si particles after homogenization. The purpose of adding Mn and Cr is to ensure a high ... -
Characterization the softening behavior of cold rolled AlMnFeSi-alloys during conditions of concurrent precipitation
Wang, Ning; Li, Yanjun; Marthinsen, Knut (Journal article, 2013)In the present work an Al-Mn-(Fe-Si) model alloy has been subjected to different homogenization treatments, to achieve materials with different microchemistry states in terms of constituents, levels of Mn in solid solution ... -
Combined effect of Mg and vacancy on the generalized planar fault energy of Al
Zhao, Dongdong; Løvvik, Ole Martin; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)By first-principles calculations, a systematic study has been undertaken to investigate the combined effect of vacancies and Mg impurities on the generalized planar fault energy (GPFE) of pure Al. It was predicted that ... -
Controlling grain structure and texture in Al-Mn from the competition between precipitation and recrystallization
Huang, Ke; Zhang, Kai; Marthinsen, Knut; Loge, RE (Journal article; Peer reviewed, 2017)The recrystallization behaviour of Al-Mn alloys (AA3xxx series alloys) is affected by randomly distributed dispersoids present before annealing, by dispersoids precipitated at grain/subgrain boundaries before the onset of ... -
Correlating oriented grain number density of recrystallisation in particle-containing aluminium alloys
Zhao, Qinglong; ZHANG, Hui-di; Huang, Ke; Marthinsen, Knut (Journal article; Peer reviewed, 2018)The recrystallized grain structure of Al–(Mn)–Fe–Si alloys after isothermal annealing was studied by electron backscatter diffraction (EBSD) technique. Statistical correlation suggests that the frequency of forming P-oriented ... -
Deformation of an Al-7Mg alloy with extensive structural micro-segregations during dynamic plastic deformation
Jin, Shenbao; Tao, Nairong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2015)The microstructure evolution and deformation behavior of an as-cast Al–7Mg alloy with severe Mg segregation zones distributed on grain boundaries and in interdendrite regions subjected to dynamic plastic deformation (DPD) ... -
Dispersoid Structures and Properties of Cr and Zr-containing 6xxx Extrusion Alloys
Tofte, Anne (Master thesis, 2015)The overall objective of this work has been to study the dispersoid structures introduced by adding Cr and Zr to an AA6082 alloy and other features which may influence and improve the mechanical properties of the alloy. ... -
Effect of soft Bi particles on grain refinement during severe plastic deformation
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)Two aluminum alloys, Al–8Zn and Al–6Bi–8Zn were subjected to equal channel angular pressing (ECAP) up to 5 passes at room temperature. The microstructural evolution and the grain refinement behavior of these alloys were ... -
Electromagnetically Enhanced Priming of Ceramic Foam Filters
Fritzsch, Robert (Doctoral thesis at NTNU;2016:250, Doctoral thesis, 2016)Impurities in aluminium can cause detrimental physical and chemical inhomogeneity in the final products, as well as potentially catastrophic failures. Hence, one of the key aspects during production of aluminium and its ... -
Engineering grain boundary structures of aluminium alloys and titanium by high strain/ strain rate deformation
Jia, Hailong (Doctoral theses at NTNU;2018:139, Doctoral thesis, 2018)A comprehensive study was carried out to clarify the effects of severe plastic deformation (SPD) and high strain rate deformation on various aluminium alloys and commercial purity titanium. Equal channel angular pressing ... -
Evolution in microstructure and properties during non-isothermal annealing of a cold-rolled Al-Mn-Fe-Si alloy with different microchemistry states
Huang, Ke; Engler, Olaf; Li, Yanjun; Marthinsen, Knut (Journal article, 2015)The softening behaviour during non-isothermal annealing of a cold-rolled Al–Mn–Fe–Si model alloy was studied as a function of the state of microchemistry, in terms of the solute level of Mn, size and spatial distribution ... -
Evolution in texture and its through-thickness variations in Al-Mg-Si-extrusions: experiments and modelling
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Aukrust, Trond; Segatori, Antonio (Chapter, 2018)The visual appearance and mechanical properties of aluminium alloy extrusions are strongly dependent on the microstructure and texture of the extruded profiles, where the desired microstructure and texture may depend on ...