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Title: Li-atoms-induced structure changes of Guinier–Preston–Bagaryatsky zones in AlCuLiMg alloys

Abstract

Guinier–Preston–Bagaryatsky (GPB) zones are the well-known strengthening precipitates of AlCuMg alloys formed upon thermal ageing. Here we report that when formed in AlCuLiMg alloys the GPB zones can change significantly in morphology and structure. It is shown that though they do still consist of Al, Cu and Mg elements fundamentally, the GPB zones in AlCuLiMg alloys have a rather different structure due to a featured Li-segregation at their interfaces with the matrix and possible Li-replacement of partial Mg atoms in the structure. As such the Li-containing GPB zones often develop from one-dimensional to quasi-two-dimensional precipitates. - Highlights: • We observe Guinier–Preston–Bagaryatsky zone variants in AlCuLiMg alloys. • We obtain atomic-resolution images of the precipitates and model their structures. • Li-atoms play a key role in modifying the structure of these precipitate variants.

Authors:
; ; ;  [1]; ; ;  [1];  [2]
  1. Center for High-Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082 (China)
  2. Advanced Research Center, Central South University, Changsha 410083 (China)
Publication Date:
OSTI Identifier:
22689657
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 121; Other Information: Copyright (c) 2016 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; AGING; ALUMINIUM BASE ALLOYS; ATOMS; COPPER ALLOYS; ELECTRON MICROSCOPY; IMAGES; INTERFACES; LITHIUM; LITHIUM ALLOYS; MAGNESIUM ALLOYS; MATRICES; MICROSTRUCTURE; MORPHOLOGY; ONE-DIMENSIONAL CALCULATIONS; PRECIPITATION; RESOLUTION; SEGREGATION; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Duan, S. Y., Le, Z., Chen, Z. K., Gao, Z., Chen, J.H., E-mail: jhchen123@hnu.edu.cn, Advanced Research Center, Central South University, Changsha 410083, Ming, W. Q., Li, S. Y., Wu, C. L., and Yan, N. Li-atoms-induced structure changes of Guinier–Preston–Bagaryatsky zones in AlCuLiMg alloys. United States: N. p., 2016. Web. doi:10.1016/J.MATCHAR.2016.09.037.
Duan, S. Y., Le, Z., Chen, Z. K., Gao, Z., Chen, J.H., E-mail: jhchen123@hnu.edu.cn, Advanced Research Center, Central South University, Changsha 410083, Ming, W. Q., Li, S. Y., Wu, C. L., & Yan, N. Li-atoms-induced structure changes of Guinier–Preston–Bagaryatsky zones in AlCuLiMg alloys. United States. https://doi.org/10.1016/J.MATCHAR.2016.09.037
Duan, S. Y., Le, Z., Chen, Z. K., Gao, Z., Chen, J.H., E-mail: jhchen123@hnu.edu.cn, Advanced Research Center, Central South University, Changsha 410083, Ming, W. Q., Li, S. Y., Wu, C. L., and Yan, N. 2016. "Li-atoms-induced structure changes of Guinier–Preston–Bagaryatsky zones in AlCuLiMg alloys". United States. https://doi.org/10.1016/J.MATCHAR.2016.09.037.
@article{osti_22689657,
title = {Li-atoms-induced structure changes of Guinier–Preston–Bagaryatsky zones in AlCuLiMg alloys},
author = {Duan, S. Y. and Le, Z. and Chen, Z. K. and Gao, Z. and Chen, J.H., E-mail: jhchen123@hnu.edu.cn and Advanced Research Center, Central South University, Changsha 410083 and Ming, W. Q. and Li, S. Y. and Wu, C. L. and Yan, N.},
abstractNote = {Guinier–Preston–Bagaryatsky (GPB) zones are the well-known strengthening precipitates of AlCuMg alloys formed upon thermal ageing. Here we report that when formed in AlCuLiMg alloys the GPB zones can change significantly in morphology and structure. It is shown that though they do still consist of Al, Cu and Mg elements fundamentally, the GPB zones in AlCuLiMg alloys have a rather different structure due to a featured Li-segregation at their interfaces with the matrix and possible Li-replacement of partial Mg atoms in the structure. As such the Li-containing GPB zones often develop from one-dimensional to quasi-two-dimensional precipitates. - Highlights: • We observe Guinier–Preston–Bagaryatsky zone variants in AlCuLiMg alloys. • We obtain atomic-resolution images of the precipitates and model their structures. • Li-atoms play a key role in modifying the structure of these precipitate variants.},
doi = {10.1016/J.MATCHAR.2016.09.037},
url = {https://www.osti.gov/biblio/22689657}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 121,
place = {United States},
year = {2016},
month = {11}
}