Microscopic Elastic Properties of Polycrystalline Mg₈₅Zn₆Y₉ Alloy with Long-Period Stacking Ordered 18R Phase Investigated by Inelastic X-ray Scattering (Special Issue on Long-Period Stacking Ordered Structure and Its Related Materials(2)) Microscopic Elastic Properties of Polycrystalline Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy with Long-Period Stacking Ordered 18R Phase Investigated by Inelastic X-ray Scattering
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Inelastic X-ray scattering measurements were performed on polycrystalline Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> 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 <i>Q</i> range measured (<i>Q</i> < ∼16 nm<sup>−1</sup>). In addition, the transverse acoustic and unknown modes are detectable in the second Brillouin zone (∼13 < <i>Q</i> < ∼26 nm<sup>−1</sup>). 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.
- MATERIALS TRANSACTIONS
MATERIALS TRANSACTIONS 56(7), 914-916, 2015
The Japan Institute of Metals and Materials