A new approach to grain boundary engineering for nanocrystalline materials

• Shigeaki Kobayashi,
• Sadahiro Tsurekawa and
• Tadao Watanabe

Beilstein J. Nanotechnol. 2016, 7, 1829–1849, doi:10.3762/bjnano.7.176

• the fractal analysis of the grain boundary microstructure. Keywords: electrical resistivity control; fractal analysis; grain boundary engineering (GBE); intergranular fracture control; nanocrystalline materials; Review Introduction Nanocrystalline metals and alloys have been receiving increased

• large size of dimples was often observed in the fracture surface of fatigued nanocrystalline metals and alloys [102][110][113][119] in relation to the presence of the {001} grain clusters. The {001} grain clusters interconnected by low-angle boundaries (indicated by white lines in Figure 6b) were

The self-similarity theory of high pressure torsion

• Yan Beygelzimer,
• Roman Kulagin,
• Laszlo S. Toth and
• Yulia Ivanisenko

Beilstein J. Nanotechnol. 2016, 7, 1267–1277, doi:10.3762/bjnano.7.117

• -similarity. Outside these ranges, the plasticity problem still has to be solved for each value of β. The results obtained have important practical implications for the proper design and analysis of HPT experiments. Keywords: deformation mechanisms; high pressure torsion; nanocrystalline metals; self

• -similarity; severe plastic deformation; Introduction High pressure torsion (HPT) is a severe plastic deformation process, which is widely used for producing nanocrystalline metals and alloys [1][2][3]. The generally accepted theory of HPT is based on the assumptions of uniformity of simple shear deformation

In situ observation of deformation processes in nanocrystalline face-centered cubic metals

• Aaron Kobler,
• Christian Brandl,
• Horst Hahn and
• Christian Kübel

Beilstein J. Nanotechnol. 2016, 7, 572–580, doi:10.3762/bjnano.7.50

• -Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany 10.3762/bjnano.7.50 Abstract The atomistic mechanisms active during plastic deformation of nanocrystalline metals are still a subject of controversy. The recently developed approach of combining automated crystal orientation mapping (ACOM) and in

• rupture of the film. In conclusion, conventional deformation mechanisms are still active in nanocrystalline metals but with different weighting as compared with conventional materials with coarser grains. Keywords: ACOM-STEM; deformation mechanisms; in situ straining; nanocrystalline metals; orientation

• research group FOR714 “Plastic deformation of nanocrystalline metals”, support by the Karlsruhe Nano Micro Facility (KNMF), a large scale Helmholtz research infrastructure operated at Karlsruhe Institute of Technology (KIT) and support by the Robert Bosch Foundation in the framework of the Endowed Chair on