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Title: Characterizing the nano-structure and defect structure of nano-scaled non-ferrous structural alloys

Abstract

The presence and interaction of nanotwins, geometrically necessary dislocations, and grain boundaries play a key role in the mechanical properties of nanostructured crystalline materials. Therefore, it is vital to determine the orientation, width and distance of nanotwins, the angle and axis of grain boundary misorientations as well as the type and the distributions of dislocations in an automatic and statistically meaningful fashion in a relatively large area. In this paper, such details are provided using a transmission electron microscope-based orientation microscopy technique called ASTAR™/precession electron diffraction. The remarkable spatial resolution of this technique (~ 2 nm) enables highly detailed characterization of nanotwins, grain boundaries and the configuration of dislocations. This orientation microscopy technique provides the raw data required for the determination of these parameters. The procedures to post-process the ASTAR™/PED datasets in order to obtain the important (and currently largely hidden) details of nanotwins as well as quantifications of dislocation density distributions are described in this study. - Highlights: • EBSD cannot characterize defects such as dislocations, grain boundaries and nanotwins in severely deformed metals. • TEM based orientation microscopy technique called ASTAR™/PED was used to resolve the problem. • Locations and orientations of nanotwins, dislocation density distribution and grainmore » boundary characters can be resolved. • This work provides the bases for further studies on the interactions between dislocations, grain boundaries and nanotwins. • The computation part is explained sufficiently which helps the readers to post process their own data.« less

Authors:
 [1];  [2]; ;  [1];  [2];  [3]; ;  [4];  [1];  [2];  [3]
  1. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011 (United States)
  2. (United States)
  3. (Denton, TX, 76203) and the Colorado School of Mines (Golden, CO, 80401) (United States)
  4. Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221 (United States)
Publication Date:
OSTI Identifier:
22587122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 113; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALLOYS; BACKSCATTERING; DATASETS; DEFECTS; DISLOCATIONS; ELECTRON DIFFRACTION; GRAIN BOUNDARIES; MECHANICAL PROPERTIES; NANOSTRUCTURES; ORIENTATION; SPATIAL DISTRIBUTION; SPATIAL RESOLUTION; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Ghamarian, Iman, E-mail: imanghamarian@yahoo.com, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, Samimi, Peyman, Liu, Yue, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas, Poorganji, Behrang, Vasudevan, Vijay K., Collins, Peter C., Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, and Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas. Characterizing the nano-structure and defect structure of nano-scaled non-ferrous structural alloys. United States: N. p., 2016. Web. doi:10.1016/J.MATCHAR.2015.10.002.
Ghamarian, Iman, E-mail: imanghamarian@yahoo.com, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, Samimi, Peyman, Liu, Yue, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas, Poorganji, Behrang, Vasudevan, Vijay K., Collins, Peter C., Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, & Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas. Characterizing the nano-structure and defect structure of nano-scaled non-ferrous structural alloys. United States. doi:10.1016/J.MATCHAR.2015.10.002.
Ghamarian, Iman, E-mail: imanghamarian@yahoo.com, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, Samimi, Peyman, Liu, Yue, Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas, Poorganji, Behrang, Vasudevan, Vijay K., Collins, Peter C., Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, and Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas. Tue . "Characterizing the nano-structure and defect structure of nano-scaled non-ferrous structural alloys". United States. doi:10.1016/J.MATCHAR.2015.10.002.
@article{osti_22587122,
title = {Characterizing the nano-structure and defect structure of nano-scaled non-ferrous structural alloys},
author = {Ghamarian, Iman, E-mail: imanghamarian@yahoo.com and Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203 and Samimi, Peyman and Liu, Yue and Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203 and Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas and Poorganji, Behrang and Vasudevan, Vijay K. and Collins, Peter C. and Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203 and Center for Advanced Non-Ferrous Structural Alloys, an NSF-I/UCRC between the University of North Texas},
abstractNote = {The presence and interaction of nanotwins, geometrically necessary dislocations, and grain boundaries play a key role in the mechanical properties of nanostructured crystalline materials. Therefore, it is vital to determine the orientation, width and distance of nanotwins, the angle and axis of grain boundary misorientations as well as the type and the distributions of dislocations in an automatic and statistically meaningful fashion in a relatively large area. In this paper, such details are provided using a transmission electron microscope-based orientation microscopy technique called ASTAR™/precession electron diffraction. The remarkable spatial resolution of this technique (~ 2 nm) enables highly detailed characterization of nanotwins, grain boundaries and the configuration of dislocations. This orientation microscopy technique provides the raw data required for the determination of these parameters. The procedures to post-process the ASTAR™/PED datasets in order to obtain the important (and currently largely hidden) details of nanotwins as well as quantifications of dislocation density distributions are described in this study. - Highlights: • EBSD cannot characterize defects such as dislocations, grain boundaries and nanotwins in severely deformed metals. • TEM based orientation microscopy technique called ASTAR™/PED was used to resolve the problem. • Locations and orientations of nanotwins, dislocation density distribution and grain boundary characters can be resolved. • This work provides the bases for further studies on the interactions between dislocations, grain boundaries and nanotwins. • The computation part is explained sufficiently which helps the readers to post process their own data.},
doi = {10.1016/J.MATCHAR.2015.10.002},
journal = {Materials Characterization},
number = ,
volume = 113,
place = {United States},
year = {Tue Mar 15 00:00:00 EDT 2016},
month = {Tue Mar 15 00:00:00 EDT 2016}
}