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

Sang Hwa Lee, Saif Haider Kayani, Jae Gil Jung, Sung Il Baik, Min Seok Kim, Young Kook Lee, Kwangjun Euh

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16 Citations (Scopus)

Abstract

We studied the crystallographic characteristics of the Al18Mg3Ti2 intermetallic phase in a solution-treated 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 (θ) at {111} planes of each phase (i.e., θ = ± m, 70.5°±m, where m = 12–14°). 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 L12-precipitate and a Zn-rich phase.

Original languageEnglish
Article number156173
JournalJournal of Alloys and Compounds
Volume844
DOIs
Publication statusPublished - 2020 Dec 5

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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