Details

Autor(en) / Beteiligte

• Guo, Cuiping
• Du, Zhenmin

Titel

Thermodynamic optimization of the Mg–Tb and Mg–Yb systems

Ist Teil von

• Journal of alloys and compounds, 2006-09, Vol.422 (1), p.102-108

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2006

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The two Mg–RE systems, Mg–Tb and Mg–Yb, have been critically assessed by means of the CALculation of PHAse Diagram (CALPHAD) technique. The solution phases (liquid, body-centered cubic, face-centered cubic and hexagonal close-packed) were modeled with the Redlich–Kister equation. The intermetallic compounds Mg 24Tb 5 and Mg 5Tb were treated as stoichiometric. The compounds, Mg 2Tb and Mg 3Tb in Mg–Tb system and Mg 2Yb in Mg–Yb system, which have a homogeneity range, were modeled using two sublattices Mg 2(Mg, Tb), Mg 3(Mg, Tb) and (Mg, Yb) 2(Mg, Yb), respectively. A three-sublattice model (Mg, Tb) 0.5(Mg, Tb) 0.5Va 3 was applied to describe the intermediate B2 compound (MgTb) in order to cope with the order–disorder transition in the Mg–Tb system. A set of self-consistent thermodynamic parameters of the Mg–Tb and the Mg–Yb system was obtained, respectively.