MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Microscopic Elastic Properties of Polycrystalline Mg85Zn6Y9 Alloy with Long-Period Stacking Ordered 18R Phase Investigated by Inelastic X-ray Scattering
Shinya HosokawaMichiaki YamasakiYoshihito KawamuraMasanori InuiYukio KajiharaSatoshi TsutsuiAlfred Q. R. Baron
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2015 Volume 56 Issue 7 Pages 914-916

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Abstract

Inelastic X-ray scattering measurements were performed on polycrystalline Mg85Zn6Y9 alloy with long-period stacking ordered 18R phase to clarify the microscopic elastic properties. Tiny but clear excitation signals of longitudinal acoustic (LA) modes are observed in the whole Q range measured (Q < ∼16 nm−1). In addition, the transverse acoustic and unknown modes are detectable in the second Brillouin zone (∼13 < Q < ∼26 nm−1). The microscopic sound velocity of the LA modes is similar to the macroscopic value. The microscopic Poisson ratio is 0.22 ± 0.04, slightly smaller than the macroscopic value of 0.26 and usual metal values of ∼0.3, indicating a hard stiffness of the bond angles.

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© 2015 The Japan Institute of Metals and Materials
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