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Blar i NTNU Open på forfatter "Marthinsen, Knut"

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Viser treff 1-20 av 87

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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 ...
    • Atomistic modelling of Fe-Al and α-AlFeSi intermetallic compound interfaces 

      Khalid, Muhammad Zeeshan (Doctoral theses at NTNU;2020:86, Doctoral thesis, 2020)
      The joining of aluminum and steel has been considered an efficient solution for building light-weight technology, particularly in the automotive, aerospace and shipbuilding industries. It is an immense challenge to join ...
    • 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) ...
    • Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling 

      Manik, Tomas; Marthinsen, Knut; Zhang, Kai; Imani Aria, Arash; Holmedal, Bjørn (Peer reviewed; Journal article, 2021)
      In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity ...
    • 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 ...
    • 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 ...
    • 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 ...

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