The unique hybrid precipitate in a peak-aged Al-Cu-Mg-Ag alloy

被引：32

作者：

Gazizov, M. R. ^{[1
]}

Boev, A. O. ^{[2
]}

Marioara, C. D. ^{[3
]}

Andersen, S. J. ^{[3
]}

Holmestad, R. ^{[4
]}

Kaibyshev, R. O. ^{[1
]}

Aksyonov, D. A. ^{[2
]}

Krasnikov, V. S. ^{[5
,6
]}

机构：

[1] Belgorod State Univ, Belgorod 308015, Russia

[2] Skolkovo Inst Sci & Technol, Moscow 143026, Russia

[3] SINTEF Ind, Mat & Nanotechnol, N-7465 Trondheim, Norway

[4] Norwegian Univ Sci & Technol NTNU, Dept Phys, N-7491 Trondheim, Norway

[5] Chelyabinsk State Univ, Chelyabinsk 454001, Russia

[6] South Ural State Univ, Natl Res Univ, Chelyabinsk 454080, Russia

来源：

SCRIPTA MATERIALIA | 2021年 / 194卷

关键词：

Aging; Scanning/transmission electron microscopy (STEM); Aluminum alloys; Precipitation; Density functional theory (DFT);

D O I：

10.1016/j.scriptamat.2020.113669

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The prevalent hardening phase forming in an Al-Cu-Mg-Ag alloy after peak-aging at 150 and 190 degrees C has been investigated using transmission electron microscopy methods. The precipitate atomic structure was determined. It is a hybrid precipitate (HP) with plate morphology on {111} Al planes, consisting of orthorhombic and hexagonal structural fragments. Density functional theory calculations suggest that the hybridization reduces structural incompatibility of the HP plates with the Al matrix at the broad interfacial boundaries. Incorporation of Cu, Mg and Ag in the bulk HP structure reduces its formation enthalpy. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：5

共 35 条

[1] On recent developments in the debate about the formation mechanism of precipitate plates [J].