Characterization of crystal structure and precipitation crystallography of a new MgxAl2-xGd phase in an Mg97Al1Gd2 alloy

X. F. Gu, T. Furuhara

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The composition, crystal structure and precipitation crystallography of a newly found precipitate are characterized by Cs-corrected scanning transmission electron microscopy. The composition of the plate-like precipitate could be expressed as MgxAl2-xGd (x = 0.38), and its crystal structure is the same as the face-centered cubic type Laves phases Mg2Gd and Al2Gd, with a lattice parameter of 7.92Å (space group No. 227,). The orientation relationship between the matrix and precipitate is found to be (0001)m//(111)p and [100]m//[10]p, and the habit plane is parallel to the (0001)m//(111)p plane. In addition, this preferred crystallography of phase transformation is well explained on the basis of the atomic matching at the interface.The composition, crystal structure and precipitation crystallography of a newfound MgxAl2-xGd precipitate are characterized by Cs-corrected scanning transmission electron microscopy.

Original languageEnglish
Pages (from-to)1177-1181
Number of pages5
JournalJournal of Applied Crystallography
Volume49
Issue number4
DOIs
Publication statusPublished - 2016 Aug 1

Keywords

  • Laves phase
  • Mg-Al-Gd
  • atomic matching
  • interfaces
  • orientation relationships

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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