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Title: Evidence that abnormal grain growth precedes fatigue crack initiation in nanocrystalline Ni-Fe

Prior studies on the high-cycle fatigue behavior of nanocrystalline metals have shown that fatigue fracture is associated with abnormal grain growth (AGG). However, those previous studies have been unable to determine if AGG precedes fatigue crack initiation, or vice-versa. The present study shows that AGG indeed occurs prior to crack formation in nanocrystalline Ni-Fe by using a recently developed synchrotron X-ray diffraction modality that has been adapted for in-situ analysis. The technique allows fatigue tests to be interrupted at the initial signs of the AGG process, and subsequent microscopy reveals the precursor damage state preceding crack initiation.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Material, Physical, and Chemical Sciences Center
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Publication Date:
Report Number(s):
SAND-2017-9766J
Journal ID: ISSN 1359-6462; PII: S1359646217305110
Grant/Contract Number:
AC04-94AL85000; AC02-76SF00515; NA0003525
Type:
Published Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 143; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Nanocrystalline; Fatigue; Fracture; Nanostructure; X-ray diffraction
OSTI Identifier:
1379978
Alternate Identifier(s):
OSTI ID: 1398778