skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in Al-Zr-Y alloy

Abstract

Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in aged Al-Zr-Y alloy was investigated through atom probe tomography (APT) and transmission electron microscope (TEM) analysis and first principles calculations. The results show that short-bar-shaped D0{sub 19}-Al{sub 3}Y with some Zr atoms dissolved in precipitated at the very beginning of decomposition and worked as heterogeneous nuclei for L1{sub 2}-Al{sub 3}Zr with spherical morphology after being aged at 400 °C for 2 h. Quasi-static coarsening happened as the aging treatment lasted from 2 h to 200 h. However, distribution of Zr and Y atoms in Al{sub 3}(Zr,Y) is nearly uniform and Al{sub 3}(Zr,Y) do not have the typical “Al{sub 3}RE core-Al{sub 3}Zr shell” structure which observed in other RE containing Al-Zr-RE alloys with L1{sub 2}-Al{sub 3}RE as nuclei. First principles calculations revealed that binding energy between Y and Zr is strong during the growth of Al{sub 3}(Zr,Y), which led to the co-precipitation of Y and Zr atoms and attribute to the evolution of Al{sub 3}(Zr,Y). - Highlights: •Al{sub 3}Y precipitated firstly and then became nuclei for Al{sub 3}Zr during aging of Al-Zr-Y. •Al{sub 3}(Zr,Y) precipitates do not have the typical “Al{sub 3}Y core-Al{sub 3}Zr shell” structure. •Strong binding between Y and Zrmore » led to the co-precipitation of Y and Zr atoms.« less

Authors:
 [1]
  1. State
Publication Date:
OSTI Identifier:
22689656
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 ALLOYS; ATOMS; BINDING ENERGY; CHEMICAL COMPOSITION; COMPUTERIZED TOMOGRAPHY; COPRECIPITATION; DECOMPOSITION; MORPHOLOGY; NUCLEATION; NUCLEI; PROBES; SPHERICAL CONFIGURATION; TEMPERATURE RANGE 0400-1000 K; TRANSMISSION ELECTRON MICROSCOPY; YTTRIUM ALLOYS; ZIRCONIUM ALLOYS

Citation Formats

Gao, Haiyan, E-mail: gaohaiyan@sjtu.edu.cn. Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in Al-Zr-Y alloy. United States: N. p., 2016. Web. doi:10.1016/J.MATCHAR.2016.10.012.
Gao, Haiyan, E-mail: gaohaiyan@sjtu.edu.cn. Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in Al-Zr-Y alloy. United States. doi:10.1016/J.MATCHAR.2016.10.012.
Gao, Haiyan, E-mail: gaohaiyan@sjtu.edu.cn. Tue . "Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in Al-Zr-Y alloy". United States. doi:10.1016/J.MATCHAR.2016.10.012.
@article{osti_22689656,
title = {Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in Al-Zr-Y alloy},
author = {Gao, Haiyan, E-mail: gaohaiyan@sjtu.edu.cn},
abstractNote = {Structural and compositional evolution of Al{sub 3}(Zr,Y) precipitates in aged Al-Zr-Y alloy was investigated through atom probe tomography (APT) and transmission electron microscope (TEM) analysis and first principles calculations. The results show that short-bar-shaped D0{sub 19}-Al{sub 3}Y with some Zr atoms dissolved in precipitated at the very beginning of decomposition and worked as heterogeneous nuclei for L1{sub 2}-Al{sub 3}Zr with spherical morphology after being aged at 400 °C for 2 h. Quasi-static coarsening happened as the aging treatment lasted from 2 h to 200 h. However, distribution of Zr and Y atoms in Al{sub 3}(Zr,Y) is nearly uniform and Al{sub 3}(Zr,Y) do not have the typical “Al{sub 3}RE core-Al{sub 3}Zr shell” structure which observed in other RE containing Al-Zr-RE alloys with L1{sub 2}-Al{sub 3}RE as nuclei. First principles calculations revealed that binding energy between Y and Zr is strong during the growth of Al{sub 3}(Zr,Y), which led to the co-precipitation of Y and Zr atoms and attribute to the evolution of Al{sub 3}(Zr,Y). - Highlights: •Al{sub 3}Y precipitated firstly and then became nuclei for Al{sub 3}Zr during aging of Al-Zr-Y. •Al{sub 3}(Zr,Y) precipitates do not have the typical “Al{sub 3}Y core-Al{sub 3}Zr shell” structure. •Strong binding between Y and Zr led to the co-precipitation of Y and Zr atoms.},
doi = {10.1016/J.MATCHAR.2016.10.012},
journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 121,
place = {United States},
year = {2016},
month = {11}
}