Transmission electron microscopy for precipitate phases in rapidly solidified Mg-2 at%Ce-1 at%Zn and Mg-2 at%Ce alloys

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Abstract

Precipitate phases in Mg-2 at%Ce-1 at%Zn (Mg97Ce 2Zn1) and Mg-2 at%Ce (Mg98Ce2) alloys, prepared by a melt-quenching method, have been examined by high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). A precipitate phase formed at grain boundaries has an ordered structure with a hexagonal unit cell of √3a0 and c0, in which a 0 and c0 are lattice parameters of an h.c.p. structure of the Mg-matrix. On the other hand, a precipitate phase embedded in Mg-matrix grains has a lone-period modulated structure formed by the appearance of two-dimensional anti-phase boundaries with a hexagonal symmetry in the fundamental hexagonal structure with lattice constants of √3a0 and c0. © 2007 The Japan Institute of Metals.

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Nishijima, M., Hiraga, K., Yamasaki, M., & Kawamura, Y. (2007). Transmission electron microscopy for precipitate phases in rapidly solidified Mg-2 at%Ce-1 at%Zn and Mg-2 at%Ce alloys. Materials Transactions, 48(3), 476–480. https://doi.org/10.2320/matertrans.48.476

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