Journal of Phase Equilibria

, Volume 14, Issue 4, pp 479–484 | Cite as

Experimental investigation of the Tb-Mg phase diagram

  • A. Saccone
  • S. Delfino
  • D. Macciò
  • R. Ferro
Section I: Basic and Applied Research


The Tb-Mg alloys were studied in the range 0 to 100 at.% Mg, by using X-ray powder diffraction, optical and scanning electron microscopy, electron probe microanalysis (EPMA), and differential thermal analysis (DTA). The following intermediate phases were identified and their crystal structures confirmed: TbMg (cubic,cP2 CsCl type), TbMg2 (hexagonal,hP12-MgZn2 type), and TbMg3 (cubic,cF16-BiF3 type). Two phases, moreover, were confirmed or identified in a composition range very close to 83 at.% Mg: χ1 phase (cubic,cF440-GdMg5 type) and χ2 phase (cubic,cI58-αMn type). All the phases show peritectic formation with the possible exception of the χ2 phase. The following phase equilibria were also determined: a eutectic reaction at 530 °C and 90.5 at.% Mg and a eutectoidal decomposition of the (βTb) phase at 670 °C and ∼28 at.% Mg.


Differential Thermal Analysis Peritectic Reaction Maximum Solid Solubility Average Atomic Volume Atomic Rare Earth Number 
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Copyright information

© ASM International 1993

Authors and Affiliations

  • A. Saccone
    • 1
  • S. Delfino
    • 1
  • D. Macciò
    • 1
  • R. Ferro
    • 1
  1. 1.Istituto di Chimica GeneraleUniversitá di Genova Viale Benedetto XVGenovaItaly

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