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The isothermal section at 500 °C of the Y-La-Mg ternary system

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Abstract

Ternary Y-La-Mg alloys have been studied by X-ray diffraction, optical microscopy, scanning electron microscopy, and electron probe microanalysis. Phase equilibria have been established in the isothermal section at 500 °C in the 50 to 100 at. Pct Mg composition range. The sections (YxLa1-x) Mg (continuous solid solution), (YxLa1-xMg2 (cF24-Cu2Mg type for 0 ≤x ≤ 0.72 and hP12-MgZn2 type for 0.82 ≤x ≤ 1 solid solutions), and YxLa1-xMg3 (0 ≤x ≤ 0.47) have been especially studied. The ≈YxLa1-xMg5 (0.35 ≤x ≤ 0.77) ternary compound (cF440-GdMg5 type) has been found. A reinvestigation of selected regions of the binary La-Mg and Y-Mg systems proved necessary. The La5Mg41 phase, not previously reported, has been found by the annealing of samples at 600 °C. The YMg2 phase shows a wide homogeneity range up to 73 at. Pct Mg. The ternary section has been compared with a simulated one that was created by placing sections of binary systems of Mg with different rare earth elements side by side. The results are related to the pseudolanthanide concept.

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Authors and Affiliations

  1. Istituto di Chimica Generale, Universita di Genova, I-16132, Genoa, Italy

    M. Giovannini (Research Assistant), A. Saccone (Associate Professor), R. Marazza (Full Professor) & R. Ferro (Full Professor and Director)

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  1. M. Giovannini
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  2. A. Saccone
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  3. R. Marazza
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  4. R. Ferro
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Giovannini, M., Saccone, A., Marazza, R. et al. The isothermal section at 500 °C of the Y-La-Mg ternary system. Metall Mater Trans A 26, 5–10 (1995). https://doi.org/10.1007/BF02669789

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  • DOI: https://doi.org/10.1007/BF02669789

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