enwei qin - Academia.edu (original) (raw)
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Max Planck Institute for Iron Research
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Papers by enwei qin
Scripta Materialia, 2009
We report an enhanced fracture toughness of bulk Cu sample processed by dynamic plastic deformati... more We report an enhanced fracture toughness of bulk Cu sample processed by dynamic plastic deformation with a composite microstructure of nanoscale grains and embedded nanoscale twin bundles. The improvement in fracture toughness is mainly due to the embedded twin bundles which generate elongated deep fracture dimples that consume much higher fracture energy.
Acta Materialia, 2009
Bulk nanocrystalline pure Cu samples with embedded nanoscale twin bundles were prepared by means ... more Bulk nanocrystalline pure Cu samples with embedded nanoscale twin bundles were prepared by means of dynamic plastic deformation (DPD) at cryogenic temperature. By adjusting the DPD parameters, we increased the volume fraction of nanotwin bundles, resulting in an increase in both tensile strength and fracture toughness. The enhanced strength is attributed to the strengthening effect of the nanotwin bundles. The highly anisotropic nanotwin lamellar structures are found to be effective in energy absorption and arresting crack propagation during fracture. Coarse and deep dimples associated with obvious recrystallization underneath were detected in the fracture surfaces, owing to the presence of the nanotwin bundles. The enhancement of fracture toughness is closely correlated with the formation of these deep dimples.
Advanced Engineering Materials, 2013
Scripta Materialia, 2009
We report an enhanced fracture toughness of bulk Cu sample processed by dynamic plastic deformati... more We report an enhanced fracture toughness of bulk Cu sample processed by dynamic plastic deformation with a composite microstructure of nanoscale grains and embedded nanoscale twin bundles. The improvement in fracture toughness is mainly due to the embedded twin bundles which generate elongated deep fracture dimples that consume much higher fracture energy.
Acta Materialia, 2009
Bulk nanocrystalline pure Cu samples with embedded nanoscale twin bundles were prepared by means ... more Bulk nanocrystalline pure Cu samples with embedded nanoscale twin bundles were prepared by means of dynamic plastic deformation (DPD) at cryogenic temperature. By adjusting the DPD parameters, we increased the volume fraction of nanotwin bundles, resulting in an increase in both tensile strength and fracture toughness. The enhanced strength is attributed to the strengthening effect of the nanotwin bundles. The highly anisotropic nanotwin lamellar structures are found to be effective in energy absorption and arresting crack propagation during fracture. Coarse and deep dimples associated with obvious recrystallization underneath were detected in the fracture surfaces, owing to the presence of the nanotwin bundles. The enhancement of fracture toughness is closely correlated with the formation of these deep dimples.
Advanced Engineering Materials, 2013