Crystallographic characterization of Al18Mg3Ti2 intermetallic phase in Al-Zn-Mg-Cu-Zr-Ti alloy
- Authors
- Lee, Sang-Hwa; Kayani, Saif Haider; Jung, Jae-Gil; Baik, Sung-Il; Kim, Min-Seok; Lee, Young-Kook; Euh, Kwangjun
- Issue Date
- Dec-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Metals and alloys; Precipitation; Crystal growth; Transmission electron microscopy, TEM
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.844
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 844
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80182
- DOI
- 10.1016/j.jallcom.2020.156173
- ISSN
- 0925-8388
- Abstract
- 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.
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Collections - 공과대학 > 신소재공학과 > 1. Journal Articles
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