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Title: Simulation of the electron diffraction patterns from needle/rod-like precipitates in Al-Mg-Si alloys

Abstract

The origin of the selected area electron diffraction (SAED) patterns from needle/rod-like metastable precipitates embedded in {alpha}-Al matrix in Al-Mg-Si alloys have been studied via an example of {beta}'' phase. In addition, the SAED pattern from {beta}'' phase has been simulated with significant improvement in comparison with the previous simulations. Three important factors, i.e. the 12 crystallographically equivalent variants of {beta}'' phase in the {alpha}-Al matrix due to the highly symmetric f.c.c. structure of {alpha}-Al, the coherence between {beta}'' phase and the {alpha}-Al matrix, and the double diffractions from the {alpha}-Al matrix and {beta}'' phase, are proved to contribute to the special square-shaped features in the SAED patterns from {beta}'' phase and thus fully taken into account in the simulation. An improved but simplified method for simulating the SAED patterns from needle/rod-like metastable precipitates has been developed. This method is further verified by simulating the SAED pattern from Q phase. The simulated SAED patterns from both {beta}'' and Q phases fit the experimentally determined patterns very well. - Highlights: {yields}An improved method has been developed to simulate the SADPs of Al alloys. {yields}The formation mechanism of SADPs of Al alloys has been systemically studied. {yields}Double diffraction contributes to the formationmore » of the SADPs of Al alloys.« less

Authors:
 [1];  [1];  [1];  [2]
  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)
  2. School of Materials Science and Engineering, Central South University, Changsha 410083 (China)
Publication Date:
OSTI Identifier:
22066390
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 62; Journal Issue: 9; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; COMPARATIVE EVALUATIONS; ELECTRON DIFFRACTION; FCC LATTICES; MAGNESIUM ALLOYS; MATRIX MATERIALS; PRECIPITATION; RODS; SILICON ALLOYS; SIMULATION

Citation Formats

Li Kai, Song Min, E-mail: Min.Song.Th05@Alum.Dartmouth.ORG, Du Yong, and Zhang Hong. Simulation of the electron diffraction patterns from needle/rod-like precipitates in Al-Mg-Si alloys. United States: N. p., 2011. Web. doi:10.1016/J.MATCHAR.2011.06.006.
Li Kai, Song Min, E-mail: Min.Song.Th05@Alum.Dartmouth.ORG, Du Yong, & Zhang Hong. Simulation of the electron diffraction patterns from needle/rod-like precipitates in Al-Mg-Si alloys. United States. doi:10.1016/J.MATCHAR.2011.06.006.
Li Kai, Song Min, E-mail: Min.Song.Th05@Alum.Dartmouth.ORG, Du Yong, and Zhang Hong. Thu . "Simulation of the electron diffraction patterns from needle/rod-like precipitates in Al-Mg-Si alloys". United States. doi:10.1016/J.MATCHAR.2011.06.006.
@article{osti_22066390,
title = {Simulation of the electron diffraction patterns from needle/rod-like precipitates in Al-Mg-Si alloys},
author = {Li Kai and Song Min, E-mail: Min.Song.Th05@Alum.Dartmouth.ORG and Du Yong and Zhang Hong},
abstractNote = {The origin of the selected area electron diffraction (SAED) patterns from needle/rod-like metastable precipitates embedded in {alpha}-Al matrix in Al-Mg-Si alloys have been studied via an example of {beta}'' phase. In addition, the SAED pattern from {beta}'' phase has been simulated with significant improvement in comparison with the previous simulations. Three important factors, i.e. the 12 crystallographically equivalent variants of {beta}'' phase in the {alpha}-Al matrix due to the highly symmetric f.c.c. structure of {alpha}-Al, the coherence between {beta}'' phase and the {alpha}-Al matrix, and the double diffractions from the {alpha}-Al matrix and {beta}'' phase, are proved to contribute to the special square-shaped features in the SAED patterns from {beta}'' phase and thus fully taken into account in the simulation. An improved but simplified method for simulating the SAED patterns from needle/rod-like metastable precipitates has been developed. This method is further verified by simulating the SAED pattern from Q phase. The simulated SAED patterns from both {beta}'' and Q phases fit the experimentally determined patterns very well. - Highlights: {yields}An improved method has been developed to simulate the SADPs of Al alloys. {yields}The formation mechanism of SADPs of Al alloys has been systemically studied. {yields}Double diffraction contributes to the formation of the SADPs of Al alloys.},
doi = {10.1016/J.MATCHAR.2011.06.006},
journal = {Materials Characterization},
issn = {1044-5803},
number = 9,
volume = 62,
place = {United States},
year = {2011},
month = {9}
}