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Title: Fracture of Ni with grain-size from nanocrystalline to ultrafine scale under cyclic loading

Abstract

A two-step fatigue loading scheme was developed to study the fracture characteristics of nanocrystalline and ultrafine-grained Ni, with grain-sizes of 23 and 260nm, respectively. Cyclic work-hardening, measured by the mid-loop width during cycling, was observed in both types of material in the first loading step. The loop width increases rapidly as the load is upgraded in the second step. Crack initiation and striation have been observed for the first time in nanocrystalline Ni.

Authors:
 [1];  [1];  [1];  [2];  [1];  [2]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
963948
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scripta Materialia; Journal Volume: 57; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; NICKEL; FATIGUE; CRACK PROPAGATION; GRAIN SIZE; STRAIN HARDENING; NANOSTRUCTURES

Citation Formats

Cheng, Sheng, Stoica, Alexandru Dan, Wang, Xun-Li, Wang, Gy, Choo, Hahn, and Liaw, Peter K. Fracture of Ni with grain-size from nanocrystalline to ultrafine scale under cyclic loading. United States: N. p., 2007. Web. doi:10.1016/j.scriptamat.2007.04.013.
Cheng, Sheng, Stoica, Alexandru Dan, Wang, Xun-Li, Wang, Gy, Choo, Hahn, & Liaw, Peter K. Fracture of Ni with grain-size from nanocrystalline to ultrafine scale under cyclic loading. United States. doi:10.1016/j.scriptamat.2007.04.013.
Cheng, Sheng, Stoica, Alexandru Dan, Wang, Xun-Li, Wang, Gy, Choo, Hahn, and Liaw, Peter K. Mon . "Fracture of Ni with grain-size from nanocrystalline to ultrafine scale under cyclic loading". United States. doi:10.1016/j.scriptamat.2007.04.013.
@article{osti_963948,
title = {Fracture of Ni with grain-size from nanocrystalline to ultrafine scale under cyclic loading},
author = {Cheng, Sheng and Stoica, Alexandru Dan and Wang, Xun-Li and Wang, Gy and Choo, Hahn and Liaw, Peter K},
abstractNote = {A two-step fatigue loading scheme was developed to study the fracture characteristics of nanocrystalline and ultrafine-grained Ni, with grain-sizes of 23 and 260nm, respectively. Cyclic work-hardening, measured by the mid-loop width during cycling, was observed in both types of material in the first loading step. The loop width increases rapidly as the load is upgraded in the second step. Crack initiation and striation have been observed for the first time in nanocrystalline Ni.},
doi = {10.1016/j.scriptamat.2007.04.013},
journal = {Scripta Materialia},
number = 3,
volume = 57,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}