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Title: Composite precipitates in a commercial Al-Li-Cu-Mg-Zr alloy

Abstract

Composite precipitates with duplex and triplex association of single precipitates commonly found in commercial Al-Li alloys were observed by transmission electron microscopy (TEM) in a re-solution and quenched AA2090 alloy after aging. These novel precipitates were the duplex association of {delta}'(Al{sub 3}Li) and T{sub 1} (Al{sub 2}CuLi) as well as the triplex {delta}'/{beta}'(Al{sub 3}Zr)/T{sub 1} and {delta}'/{beta}'/{theta}'(Al{sub 2}Cu). The reduction of elastic energy associated with composite precipitate formation is suggested as a basic mechanism with plate-like T{sub 1} and {theta}' particles serving as preferential sites for nucleation of either {delta}' or {delta}'/{beta}' spherical particles, which although in much smaller numbers, represent a volume fraction of 10 to 20% of all precipitates.

Authors:
 [1];  [2]
  1. Laboratory for Advanced Materials, State University of the Northern Rio de Janeiro, Av.Alberto Lamego 2000 Horto - Campos CEP 28015-620, Rio de Janeiro (Brazil). E-mail: lucho@uenf.br
  2. Laboratory for Advanced Materials, State University of the Northern Rio de Janeiro, Av.Alberto Lamego 2000 Horto - Campos CEP 28015-620, Rio de Janeiro (Brazil)
Publication Date:
OSTI Identifier:
21003530
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 58; Journal Issue: 2; Other Information: DOI: 10.1016/j.matchar.2006.04.008; PII: S1044-5803(06)00106-9; Copyright (c) 2006 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; AGING; ALUMINIUM ALLOYS; COPPER ALLOYS; ELECTRON DIFFRACTION; LITHIUM ALLOYS; MAGNESIUM ALLOYS; NUCLEATION; PLATES; PRECIPITATION; TRANSMISSION ELECTRON MICROSCOPY; ZIRCONIUM ALLOYS

Citation Formats

Terrones, Luis Augusto H., and Monteiro, Sergio Neves. Composite precipitates in a commercial Al-Li-Cu-Mg-Zr alloy. United States: N. p., 2007. Web. doi:10.1016/j.matchar.2006.04.008.
Terrones, Luis Augusto H., & Monteiro, Sergio Neves. Composite precipitates in a commercial Al-Li-Cu-Mg-Zr alloy. United States. doi:10.1016/j.matchar.2006.04.008.
Terrones, Luis Augusto H., and Monteiro, Sergio Neves. Thu . "Composite precipitates in a commercial Al-Li-Cu-Mg-Zr alloy". United States. doi:10.1016/j.matchar.2006.04.008.
@article{osti_21003530,
title = {Composite precipitates in a commercial Al-Li-Cu-Mg-Zr alloy},
author = {Terrones, Luis Augusto H. and Monteiro, Sergio Neves},
abstractNote = {Composite precipitates with duplex and triplex association of single precipitates commonly found in commercial Al-Li alloys were observed by transmission electron microscopy (TEM) in a re-solution and quenched AA2090 alloy after aging. These novel precipitates were the duplex association of {delta}'(Al{sub 3}Li) and T{sub 1} (Al{sub 2}CuLi) as well as the triplex {delta}'/{beta}'(Al{sub 3}Zr)/T{sub 1} and {delta}'/{beta}'/{theta}'(Al{sub 2}Cu). The reduction of elastic energy associated with composite precipitate formation is suggested as a basic mechanism with plate-like T{sub 1} and {theta}' particles serving as preferential sites for nucleation of either {delta}' or {delta}'/{beta}' spherical particles, which although in much smaller numbers, represent a volume fraction of 10 to 20% of all precipitates.},
doi = {10.1016/j.matchar.2006.04.008},
journal = {Materials Characterization},
number = 2,
volume = 58,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}