Abstract
Dynamical mechanical and positron annihilation spectroscopies were applied to study the structure of two Fe-Ga alloys with 18 and 21 at. pct Ga after quenching and subsequent annealing. It was found that the alloy with 18 pct Ga has much better damping capacity (Ψ ≈ 30 pct) than the alloy with 21 pct Ga (Ψ ≈ 5 pct). The reason for that is the ordering of the Ga atoms in Fe-21Ga alloy. Ordering processes in both alloys are studied at heating by differential scanning calorimetry, dilatometry, and internal friction or by step-by-step annealing using positron annihilation spectroscopy and hardness tests. Experimental results are explained by sequence of ordering transitions: A2 → D03 → L12.
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The reported study was supported by RFBR (Russia) research project 14-03-00165a and Russian Federation State Task No. 1855. The authors are grateful to Dr. L.V. Elnikova for discussions.
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Manuscript submitted August 4, 2014.
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Golovin, I.S., Dubov, L.Y., Funtikov, Y.V. et al. Study of Ordering and Properties in Fe-Ga Alloys With 18 and 21 at. pct Ga. Metall Mater Trans A 46, 1131–1139 (2015). https://doi.org/10.1007/s11661-014-2721-3
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DOI: https://doi.org/10.1007/s11661-014-2721-3