TY - JOUR
T1 - Structure modulation driven by cyclic deformation in nanocrystalline NiFe
AU - Cheng, Sheng
AU - Zhao, Yonghao
AU - Wang, Yinmin
AU - Li, Ying
AU - Wang, Xun-Li
AU - Liaw, Peter K.
AU - Lavernia, Enrique J.
PY - 2010/6/24
Y1 - 2010/6/24
N2 - Theoretical modeling suggests that the grain size remains unchanged during fatigue crack growth in nanocrystalline metals. Here we demonstrate that a modulated structure is generated in a nanocrystalline Ni-Fe alloy under cyclic deformation. Substantial grain coarsening and loss of growth twins are observed in the path of fatigue cracks, while the grains away from the cracks remain largely unaffected. Statistical analyses suggest that the grain coarsening is realized through the grain lattice rotation and coalescence and the loss of growth twins may be related to the detwinning process near crack tip. © 2010 The American Physical Society.
AB - Theoretical modeling suggests that the grain size remains unchanged during fatigue crack growth in nanocrystalline metals. Here we demonstrate that a modulated structure is generated in a nanocrystalline Ni-Fe alloy under cyclic deformation. Substantial grain coarsening and loss of growth twins are observed in the path of fatigue cracks, while the grains away from the cracks remain largely unaffected. Statistical analyses suggest that the grain coarsening is realized through the grain lattice rotation and coalescence and the loss of growth twins may be related to the detwinning process near crack tip. © 2010 The American Physical Society.
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U2 - 10.1103/PhysRevLett.104.255501
DO - 10.1103/PhysRevLett.104.255501
M3 - RGC 21 - Publication in refereed journal
SN - 0031-9007
VL - 104
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
M1 - 255501
ER -