Crystallographic characterization of Al18Mg3Ti2 intermetallic phase in Al-Zn-Mg-Cu-Zr-Ti alloy

被引：22

作者：

Lee, Sang-Hwa ^{[1
,2
]}

Kayani, Saif Haider ^{[1
,3
]}

Jung, Jae-Gil ^{[1
]}

Baik, Sung-Il ^{[4
]}

Kim, Min-Seok ^{[1
]}

Lee, Young-Kook ^{[2
]}

Euh, Kwangjun ^{[1
,3
]}

机构：

[1] Korea Inst Mat Sci, Metall Mat Div, Chang Won 51508, South Korea

[2] Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea

[3] Korea Univ Sci & Technol UST, Adv Mat Engn, Daejeon 34113, South Korea

[4] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 844卷

关键词：

Metals and alloys; Precipitation; Crystal growth; Transmission electron microscopy; TEM; TENSILE PROPERTIES; ALUMINUM-ALLOY; MICROSTRUCTURE; BEHAVIOR; HARDNESS;

D O I：

10.1016/j.jallcom.2020.156173

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We studied the crystallographic characteristics of the Al18Mg3Ti2 intermetallic phase in a solutiontreated Al-7.6Zn-2.6Mg-2.0Cu-0.1Zr-0.07Ti (wt.%) alloy utilizing transmission electron microscopy (TEM). Cubic spinel Al18Mg3Ti2 intermetallic phase features {111) faceted interfaces with the Al matrix. Selected-area electron diffraction pattern, stereographic projection, and atomic projection studies indicated four possible orientation relationships between the Al18Mg3Ti2 phase and the Al matrix, which are categorized by a misorientation angle (theta) at {111) planes of each phase (i.e., theta = +/- m, 70.5 degrees +/- m, where m = 12-14 degrees). High resolution TEM analyses confirmed that the growth of the Al18Mg3Ti2 intermetallic phase is based on the ledge mechanism on the {111) interfaces along with multiple {111) twinning. This growth mechanism of the Al18Mg3Ti2 phase contributes to the formation of faceted morphologies with {111) interfaces. The interface between the Al18Mg3Ti2 phase and Al matrix provides a heterogeneous nucleation site for the L1(2)-precipitate and a Zn-rich phase. (c) 2020 Elsevier B.V. All rights reserved.

引用

页数：9

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