Thermochemistry of alloys of transition metals: alloys of copper with scandium, yttrium, lanthanum, and lutetium

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · Metall. Trans., B; (United States)

DOI:https://doi.org/10.1007/BF02667340· OSTI ID:5137443

Watanabe, S; Kleppa, O J

The enthalpies of mixing of liquid copper with liquid lanthanum, and with solid scandium, yttrium, and lutetium have been measured by high temperature reaction calorimetry at 1373 K. After correction for the enthalpies of fusion the limiting enthalpies of solution of the liquid metals in copper ar -102 kJ mol/sup -1/ (Sc), -105 kJ mol/sup -1/ (Y), -103 kJ mol/sup -1/ (La), and -120 kJ mol/sup -1/ (Lu). We also report approximate enthalpies of solution of chromium and vanadium in copper; all values are compared with predictions published by Miedema and co-workers. The enthalpies of formation of eight congruent melting intermetallic compounds in the system Cu-Sc, Cu-Y, and Cu-La have been determined. The values are compared with corresponding data for the liquid alloys; this comparison provides approximate enthalpies and entropies of fusion for the intermetallic compounds. It is found that these entropies of fusion average 1.1R to 1.2R, i.e., the values are comparable to those foun for close-packed cubic metals. This indicates that the disordering of the two atoms probably contributes little to the entropies of fusion of the compounds.

• Research Organization: Tohoku Univ.
• OSTI ID: 5137443
• Journal Information: Metall. Trans., B; (United States), Journal Name: Metall. Trans., B; (United States) Vol. 15B:2; ISSN MTTBC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CALORIMETRY
CHROMIUM ALLOYS
COPPER ALLOYS
ELEMENTS
ENTHALPY
FLUIDS
FORMATION HEAT
INTERMETALLIC COMPOUNDS
LANTHANUM ALLOYS
LIQUID METALS
LIQUIDS
LUTETIUM ALLOYS
MELTING
METALS
MIXING HEAT
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
REACTION HEAT
SCANDIUM ALLOYS
SOLUTION HEAT
THERMODYNAMIC PROPERTIES
VANADIUM ALLOYS
YTTRIUM ALLOYS