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Browsing Institutt for materialteknologi by Journals "Acta Materialia"

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Now showing items 1-13 of 13

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    • 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 ...
    • Effect of Ag addition on the precipitation evolution and interfacial segregation for Al?Mg?Si alloy 

      Weng, Yaoyao; Ding, Lipeng; Zhang, Zezhong; Jia, Zhihong; Wen, Boyang; Liu, Yingying; Muraishi, Shinji; Li, Yanjun; Liu, Qing (Journal article; Peer reviewed, 2019)
      The effect of Ag addition on the precipitation evolution and interfacial segregation for Al–Mg–Si alloys was systematically investigated by atomic resolution high-angle annular dark-field scanning transmission electron ...
    • Enhanced dispersoid precipitation and dispersion strengthening in an Al alloy by microalloying with Cd 

      Qian, Feng; Jin, Shenbao; Sha, Gang; Li, Yanjun (Journal article; Peer reviewed, 2018)
      The dispersion hardening effect of Mn(Fe)-containing dispersoids in aluminium alloys has long been ignored since it is difficult to achieve a high number density of fine dispersoids with conventional alloying compositions. ...
    • Formation of {11-21} twin boundaries in titanium by kinking mechanism through accumulative dislocation slip 

      Jin, Shenbao; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2016)
      The twinning behavior and kinking behavior of a commercial purity Ti subjected to room temperature dynamic plastic deformation (DPD) has been studied. Three types of deformation twins, {1012}, {1122} and {1121}, have been ...
    • Heterogeneous nucleation and grain growth of inoculated aluminium alloys: An integrated study by in-situ X-radiography and numerical modelling 

      Xu, Yijiang; Casari, Daniele; Du, Qiang; Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun (Journal article; Peer reviewed, 2017)
      A comprehensive study on the heterogeneous nucleation and grain growth of Al-10 wt.%Cu alloys inoculated with Al-5Ti-1B was carried out. To further reveal the solute segregation stifling mechanism, in-situ near-isothermal ...
    • Local structural coupling of A- and B-site disorder in perovskite bismuth-based piezoelectrics 

      Jiang, Bo; Lin, De-Ye; Grande, Tor; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2019)
      The local and average structure of (1-x)Bi0.5K0.5TiO3-xBiFeO3 (BKT-xBFO, x = 0.25 and 0.5) solid solutions are studied by synchrotron X-ray total scattering from ambient to 773 K. Pair distribution functions (PDFs) demonstrate ...
    • Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model 

      Du, Qiang; Tang, Kai; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Holmedal, Bjørn; Holmestad, Randi (Journal article, 2017)
      The formation of the equilibrium precipitation phase during ageing treatment of Al-Mg-Si alloys is preceded by a series of metastable phases. Given longer ageing time, higher ageing temperature or elevated temperature ...
    • Quantifying the grain boundary segregation strengthening induced by post-ECAP aging in an Al-5Cu alloy 

      Jia, Hailong; Bjørge, Ruben; Cao, Lingfei; Hui, Song; Marthinsen, Knut; Li, Yanjun (Journal article, 2018)
      Hardening on annealing (HOA) has been frequently observed in nanostructured metals and alloys. For nanostructured materials obtained by severe plastic deformation (SPD), HOA has been attributed to the reduction of dislocation ...
    • Retrieval of three-dimensional spatial information from fast in situ two-dimensional synchrotron radiography of solidification microstructure evolution 

      Mirihanage, Wajira; Falch, Ken Vidar; Snigireva, Irina; Snigirev, A; Li, Yanjun; Arnberg, Lars; Mathiesen, Ragnvald (Journal article; Peer reviewed, 2014)
      In situ synchrotron X-ray radiography of columnar dendritic growth in Al–15 wt.% Cu–9 wt.% Si–0.015 wt.% Sr alloy has been carried out with the temporal and spatial resolutions of 100 ms and 0.65 μm, respectively. ...
    • Revealing the heterogeneous nucleation behavior of equiaxed grains of inoculated Al alloys during directional solidification 

      Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun (Journal article, 2018)
      An in-situ study on the directional solidification of an inoculated Al-20 wt%Cu alloy under well-controlled constant cooling rates and temperature gradients has been carried out using a microfocus X-radiography set-up. The ...
    • Segregation of Mg, Cu and their effects on the strength of Al S5 (210) [001] symmetrical tilt grain boundary 

      Zhao, Dongdong; Løvvik, Ole Martin; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2018)
      Alien elemental segregation can pronouncedly change the grain boundary properties. Systematic first-principles calculations were performed to investigate the Mg and Cu segregation behavior at Σ5 (210)[001] symmetrical tilt ...
    • The interaction between vacancies and twin walls, junctions, and kinks, and their mechanical properties in ferroelastic materials 

      He, Xiaomei; Li, Suzhi; Ding, Xiangdong; Sun, Jun; Selbach, Sverre Magnus; Salje, Ekhard K. H. (Journal article; Peer reviewed, 2019)
      Vacancies strongly interact with twin boundaries and often change dramatically the properties of the ferroelastic material. However, the understanding of this behavior at an atomic-level is still deficient. Here we study ...
    • α-Mg primary phase formation and dendritic morphology transition in solidification of a Mg-Nd-Gd-Zn-Zr casting alloy 

      Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Sillekens, Wim H.; Mathiesen, Ragnvald (Journal article; Peer reviewed, 2016)
      Microstructure evolution in the commercial Mg-Nd-Gd-Zn-Zr alloy Elektron 21, solidified under nearly isothermal conditions, has been studied via in-situ X-ray radiography. For cooling rates View the MathML source≤0.075 ...

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