Structure modulation driven by cyclic deformation in nanocrystalline NiFe. Academic Article

abstract

• 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.

authors

• Lavernia Borrego, Enrique

published proceedings

• Phys Rev Lett

author list (cited authors)

• Cheng, S., Zhao, Y., Wang, Y., Li, Y., Wang, X., Liaw, P. K., & Lavernia, E. J.

complete list of authors

• Cheng, Sheng||Zhao, Yonghao||Wang, Yinmin||Li, Ying||Wang, Xun-Li||Liaw, Peter K||Lavernia, Enrique J

publication date

• June 2010

publisher

• American Physical Society (APS)  Publisher

published in

• Physical Review Letters  Journal

keywords

• 40 Engineering
• 4016 Materials Engineering

PubMed Central ID

• 20867394

Digital Object Identifier (DOI)

• 10.1103/PhysRevLett.104.255501

start page

• 255501

volume

• 104

issue

• 25

URL

• http://dx.doi.org/10.1103/physrevlett.104.255501