The structure of a long-period stacking phase in an Mg–Al–Y alloy studied by electron microscopy. Issue 24 (23rd August 2018)

• Record Type: Journal Article
• Authors: Takeda, Mitsuhiro; Konno, Kazuya; Yasuhara, Akira; Hiraga, Kenji
• Is Part Of: Philosophical magazine. Volume 98:Issue 24(2018)
• Page Start: 2247
• Page End: 2256
• Publication Date: 2018-08-23
• Subjects: Magnesium alloy -- magnesium–aluminum–yttrium -- long-period stacking structure -- ordered structure -- electron microscopy -- STEM; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2018.1480837
• Languages: English
• ISSNs: 1478-6435

Abstract

ABSTRACT: A new phase with a 10H-type long-period stacking (LPS) structure was found in an Mg75 Al10 Y15 alloy annealed at 823 K. The LPS structure in the Mg75 Al10 Y15 alloy annealed at 823 K for 2 h has an ordered arrangement of L12 -type structural Al6 Y8 clusters on the two-dimensional plane parallel to the c -plane of hexagonal Mg lattice and a disordered arrangement along the c -axis, whereas a perfectly ordered structure along the c -axis, which has a period with two times of that of the 10H-type LPS structure, was established by annealing at 823 K for 24 h. The structural model of the ordered LPS phase is proposed by high-resolution images taken with a Cs-corrected scanning transmission electron microscope and also electron diffraction patterns.