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Title: Strengthening via deformation twinning in a nickel alloy

Abstract

In this study, nanograins and nanotwins are produced in specimens using one processing technique to allow direct comparison in their nanohardnesses. It is shown that the hardness of nanotwins can be close to the lower end of the hardness of nanograins. The resistance of nanotwins to dislocation movement is explained based on elastic interactions between the incident 60° dislocation and the product dislocations. The latter includes one Shockley partial at the twin boundary and one 60° dislocation in the twinned region. The analysis indicates that a resolved shear stress of at least 1.24 GPa is required for a 60° dislocation to pass across a twin boundary in the nickel alloy investigated. It is this high level of the required shear stress coupled with a limited number of dislocations that can be present between two adjacent twin boundaries that provides nanotwins with high resistance to dislocation movement. The model proposed is corroborated by the detailed analysis of high-resolution transmission electron microscopy.

Authors:
 [1];  [1];  [2];  [3]
  1. Univ. of Connecticut, Storrs, CT (United States). Department of Chemical, Materials and Biomolecular Engineering
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnology (CINT)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Electrochemical Energy Laboratory
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1426945
Report Number(s):
SAND-2007-1949J
Journal ID: ISSN 0921-5093; 526865
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 480; Journal Issue: 1-2; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Nanomaterials; Twins; Nickel alloys; Strengthening

Citation Formats

Shaw, Leon L., Villegas, Juan, Huang, Jian-Yu, and Chen, Shuo. Strengthening via deformation twinning in a nickel alloy. United States: N. p., 2007. Web. doi:10.1016/j.msea.2007.06.072.
Shaw, Leon L., Villegas, Juan, Huang, Jian-Yu, & Chen, Shuo. Strengthening via deformation twinning in a nickel alloy. United States. doi:10.1016/j.msea.2007.06.072.
Shaw, Leon L., Villegas, Juan, Huang, Jian-Yu, and Chen, Shuo. Sun . "Strengthening via deformation twinning in a nickel alloy". United States. doi:10.1016/j.msea.2007.06.072. https://www.osti.gov/servlets/purl/1426945.
@article{osti_1426945,
title = {Strengthening via deformation twinning in a nickel alloy},
author = {Shaw, Leon L. and Villegas, Juan and Huang, Jian-Yu and Chen, Shuo},
abstractNote = {In this study, nanograins and nanotwins are produced in specimens using one processing technique to allow direct comparison in their nanohardnesses. It is shown that the hardness of nanotwins can be close to the lower end of the hardness of nanograins. The resistance of nanotwins to dislocation movement is explained based on elastic interactions between the incident 60° dislocation and the product dislocations. The latter includes one Shockley partial at the twin boundary and one 60° dislocation in the twinned region. The analysis indicates that a resolved shear stress of at least 1.24 GPa is required for a 60° dislocation to pass across a twin boundary in the nickel alloy investigated. It is this high level of the required shear stress coupled with a limited number of dislocations that can be present between two adjacent twin boundaries that provides nanotwins with high resistance to dislocation movement. The model proposed is corroborated by the detailed analysis of high-resolution transmission electron microscopy.},
doi = {10.1016/j.msea.2007.06.072},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = 1-2,
volume = 480,
place = {United States},
year = {2007},
month = {7}
}

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Cited by: 16 works
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