• An unreported precipitate orientation relationship in Al-Zn-Mg based alloys 

      Bendo, Artenis; Matsuda, Kenji; Lervik, Adrian; Tsuru, Tomohito; Nishimura, Katsuhiko; Nunomura, Norio; Holmestad, Randi; Marioara, Calin Daniel; Shimuzu, Kazuyuki; Toda, Hiroyuki; Yamaguchi, Masatake (Journal article; Peer reviewed, 2019)
      Characterization of precipitates in Al-Zn-Mg alloys, using a combination of electron diffraction, bright field transmission electron microscopy and atomic scale scanning transmission electron microscopy imaging revealed ...
    • Atomic structure of solute clusters in Al-Zn-Mg alloys 

      Lervik, Adrian; Thronsen, Elisabeth; Friis, Jesper; Marioara, Calin Daniel; Wenner, Sigurd; Bendo, Artenis; Matsuda, Kenji; Holmestad, Randi; Andersen, Sigmund Jarle (Journal article; Peer reviewed, 2021)
      Scanning transmission electron microscopy imaging of Al–Zn–Mg alloys has provided new information on the atomic structures of solute rich clusters forming from a supersaturated solid solution at low temperatures. A unique ...
    • Characterisation of structural similarities of precipitates in Mg–Zn and Al–Zn–Mg alloys systems 

      Bendo, Artenis; Maeda, Tomoyoshi; Matsuda, Kenji; Lervik, Adrian; Holmestad, Randi; Marioara, Calin Daniel; Nishimura, Katsuhiko; Nunomura, Norio; Toda, Hiroyuki; Yamaguchi, Masatake; Ikeda, Ken-ichi; Homma, Tomoyuki (Journal article; Peer reviewed, 2019)
      High angle annular dark field scanning transmission electron microscopy has been employed to observe precipitate structures in Al–Zn–Mg and Mg–Zn alloys. h1 precipitate structures in Al–Zn–Mg are commonly formed by MgZn2 ...
    • Comparing intergranular corrosion in Al‐Mg‐Si‐Cu alloys with and without α‐Al(Fe,Mn,Cu)Si particles 

      Lervik, Adrian; Danbolt, Turid; Furu, Trond; Holmestad, Randi; Lunder, Otto (Peer reviewed; Journal article, 2020)
      In this study, a model alloy without Fe and Mn additions, is compared with a commercial AA6005 alloy to further understand how the α‐Al(Fe,Mn,Cu)Si particles affect intergranular corrosion (IGC) behaviour. Both alloys were ...
    • Copper enrichment on aluminium surfaces after electropolishing and its effect on electron imaging and diffraction 

      Wenner, Sigurd; Lervik, Adrian; Thronsen, Elisabeth; Marioara, Calin Daniel; Kubowicz, Stephan; Holmestad, Randi (Peer reviewed; Journal article, 2021)
      Electropolishing is the most common method of preparing samples of aluminium alloys for scanning and transmission electron microscopy, as it yields a good surface quality and large flat, electron-transparent areas. Like ...
    • Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al-Zn-Mg Alloy 

      Matsuda, Kenji; Yasumoto, Toru; Bendo, Artenis; Tsuchiya, Taiki; Lee, Seungwon; Nishimura, Katsuhiko; Nunomura, Norio; Marioara, Calin Daniel; Lervik, Adrian; Holmestad, Randi; Toda, Hiroyuki; Yamaguchi, Masatake; Ikeda, Ken-ichi; Homma, Tomoyuki; Ikeno, Susumu (Journal article; Peer reviewed, 2019)
      The effect of Cu-addition on age-hardening and precipitation have been investigated by hardness measurement, tensile test, high resolution transmission electron microscopy (HRTEM) and high angle annular dark field scanning ...
    • Grain boundary structures and their correlation with intergranular corrosion in an extruded Al-Mg-Si-Cu alloy 

      Lervik, Adrian; Wenner, Sigurd; Lunder, Otto; Marioara, Calin Daniel; Holmestad, Randi (Peer reviewed; Journal article, 2020)
      A detailed analysis of grain boundaries in a highly textured Al-Mg-Si-Cu alloy is presented in this work. Electron backscatter diffraction demonstrates the presence of three main categories of grain boundaries in addition ...
    • Microstructural Characterisation of Features Related to Grain Boundary Corrosion Phenomena in Aluminium Alloys 

      Lervik, Adrian (Doctoral theses at NTNU;2020:260, Doctoral thesis, 2020)
      Aluminium (Al) alloys are of great interest as components for the automotive and aerospace industries. These alloys have great mechanical properties and are lighter than their alternatives. Light alloys will effectively ...
    • Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases 

      Lervik, Adrian; Marioara, Calin Daniel; Kadanik, Maria; Walmsley, John; Milkereit, Benjamin; Holmestad, Randi (Journal article; Peer reviewed, 2019)
      Precipitation behaviour in an industrially extruded AA7003 alloy has been studied using Transmission Electron Microscopy (TEM) together with Differential Scanning Calorimetry (DSC). Air Cooling (AC) after solution heat ...
    • Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy 

      Lervik, Adrian; Walmsley, John Charles; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto; Holmestad, Randi (Peer reviewed; Journal article, 2020)
      Stress corrosion cracking (SCC) in Cu-free Al-Zn-Mg (7xxx) aluminium alloys limits its use in many applications. In this work, we study in detail the microstructure of a peak and slightly overaged condition in an AA7003 ...
    • The correlation between intergranular corrosion resistance and copper content in the precipitate microstructure in an AA6005A alloy 

      Marioara, Calin Daniel; Lervik, Adrian; Grønvold, Julie; Lunder, Otto; Wenner, Sigurd; Furu, Trond; Holmestad, Randi (Journal article; Peer reviewed, 2018)
      A positive correlation is observed between the amount of Cu incorporated in hardening precipitates and intergranular corrosion resistance in an artificially aged Cu-containing 6005A alloy. Three mechanisms have been ...