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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Structure modulation driven by cyclic deformation in nanocrystalline NiFe.

Sheng Cheng1, Yonghao Zhao, Yinmin Wang

  • 1Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA. scheng1@utk.edu

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Nanocrystalline metals show grain coarsening and loss of growth twins during fatigue crack growth. This contradicts theoretical models, indicating a modulated structure forms near cracks in Ni-Fe alloys.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nanotechnology

Background:

  • Theoretical models predict stable grain size during fatigue crack growth in nanocrystalline metals.
  • Nanocrystalline materials offer unique properties due to their small grain size.

Purpose of the Study:

  • To investigate the microstructural evolution during fatigue crack growth in nanocrystalline metals.
  • To challenge existing theoretical models regarding grain size stability.

Main Methods:

  • Cyclic deformation of a nanocrystalline Ni-Fe alloy.
  • Microstructural analysis using advanced imaging techniques.
  • Statistical analysis of grain size and twin structures.

Main Results:

  • A modulated structure was observed in the nanocrystalline Ni-Fe alloy under cyclic loading.
  • Significant grain coarsening and loss of growth twins occurred along the fatigue crack path.
  • Grains distant from the crack remained largely unchanged, while near-crack regions exhibited coarsening via lattice rotation and coalescence.

Conclusions:

  • Fatigue crack growth in nanocrystalline Ni-Fe alloys induces significant microstructural changes, including grain coarsening and twin loss.
  • Observed grain coarsening mechanisms involve lattice rotation and coalescence.
  • Detwinning processes near the crack tip may explain the loss of growth twins.