Structural relationship between one-dimensional crystals of Guinier-Preston-Bagaryatsky zones in Al-Cu-Mg alloys

被引：40
作者：
Kovarik, L. [1 ,2 ]
Mills, M. J. [2 ]
机构：
[1] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
[2] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA
来源：
SCRIPTA MATERIALIA | 2011年 / 64卷 / 11期
关键词：
Aluminium alloys; Metastable phases; Crystal structure; Scanning/transmission electron microscopy (STEM); Density functional theory; TRANSMISSION ELECTRON-MICROSCOPY; ROOM-TEMPERATURE PRECIPITATION; YIELD-STRENGTH DEVELOPMENT; TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; ULTRASOFT PSEUDOPOTENTIALS; REACTION-KINETICS; ATOM-PROBE; GPB ZONES; EVOLUTION;
D O I：
10.1016/j.scriptamat.2011.01.033
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The crystal structure of Guinier-Preston-Bagaryatsky (GPB) zones in Al-Cu-Mg alloys is unique, consisting of agglomerated one-dimensional (1D) crystals. This work identifies and fully describes a new type of 1D crystal of the GPB zone family based on high-resolution scanning transmission electron microscopy. The observation enables the structural relationship between the possible 1D crystals to be generalized. Ab initio calculations show that the newly identified 1D crystal has a formation energy that is comparable to larger types, and much more favorable than face-centered-cubic-based models. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：999 / 1002
页数：4
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