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Title: Solid state amorphization of nanocrystalline nickel by cryogenic laser shock peening

In this study, complete solid state amorphization in nanocrystalline nickel has been achieved through cryogenic laser shock peening (CLSP). High resolution transmission electron microscopy has revealed the complete amorphous structure of the sample after CLSP processing. A molecular dynamic model has been used to investigate material behavior during the shock loading and the effects of nanoscale grain boundaries on the amorphization process. It has been found that the initial nanoscale grain boundaries increase the initial Gibbs free energy before plastic deformation and also serve as dislocation emission sources during plastic deformation to contribute to defect density increase, leading to the amorphization of pure nanocrystalline nickel.
Authors:
; ; ; ;  [1] ; ;  [2]
  1. Department of Mechanical Engineering, University of Akron, Akron, Ohio 44325 (United States)
  2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
Publication Date:
OSTI Identifier:
22492785
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMORPHOUS STATE; DISLOCATIONS; EMISSION; FREE ENTHALPY; GRAIN BOUNDARIES; LASERS; NANOSTRUCTURES; NICKEL; PROCESSING; RESOLUTION; SHOT PEENING; TRANSMISSION ELECTRON MICROSCOPY