Abstract
Abstract The enthalpies of mixing in liquid alloys of the binary Cu-Eu and ternary Al-Cu-Eu systems were determined over a wide range of compositions by means of isoperibolic calorimetry in the temperature range 1 300 - 1450 K. The enthalpies of mixing in the Cu-Eu system demonstrate small exothermic effects (ΔHmin = -4.1 ± 0.5 kJ · mol-1at xCu = 0.70). The measurements for the liquid ternary Al- Cu-Eu alloys were performed along five sections (xCu/ xEu = 0.70/0.30; 0.50/0.50 and 0.27/0.73 for xAl changed from 0 up to 0.30 and xAl/xEu = 0.20/0.80 and 0.47/0.53 for xCu changed from 0 up to 0.30). The enthalpies of mixing in the ternary system were found to be exothermic and increasing in absolute values from the Al corner towards the Al0.40Cu0.60-Al0.60Eu0.40section and from the constituent binary Cu-Eu system towards the same section. The minimum value of the integral enthalpy of mixing is expected in the vicinity of the Al0.6Eu0.4composition of the binary constituent Al-Eu system (about -23.00 kJ · mol-1).
Highlights
The thermodynamic properties of liquid aluminium alloys with transition and the rare-earth metals are being studied quite intensively, since the data on the thermodynamics of liquid phase are important for thermodynamic description of phase diagrams of the corresponding systems
Additives of lanthanides, including europium, to aluminium and its alloys with copper and other transition metals improve the mechanical properties of the materials, contribute to improvement of electrical and to the appearance of interesting magnetic properties [1 – 3]
The enthalpies of mixing for the liquid Cu–Eu alloys were measured within the whole concentration interval at 1 313 K and at 1 400 K
Summary
The thermodynamic properties of liquid aluminium alloys with transition and the rare-earth metals are being studied quite intensively, since the data on the thermodynamics of liquid phase are important for thermodynamic description of phase diagrams of the corresponding systems. Information on phase diagrams is important both for materials science re-. Additives of lanthanides, including europium, to aluminium and its alloys with copper and other transition metals improve the mechanical properties of the materials, contribute to improvement of electrical and to the appearance of interesting magnetic properties [1 – 3]. Liquid alloys containing europium remain the least studied among lanthanide alloys and require further systematic investigation. The enthalpies of mixing of liquid alloys of the Cu–Eu binary system and the Al–Cu–Eu ternary system are studied
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