We have studied composition dependences of kinematic viscosity for Fe-Cu melts with the aim of determining the temperature and composition ranges where chemically inhomogeneous Fe-Cu melts exist. Measurements were performed during heating and cooling in the temperature range from 1550 to 1700A degrees C. Evidence has been found for chemical inhomogeneity of Fe-Cu melts in the form of both microheterogeneity and a nonuniform distribution of dissimilar atoms. We have determined the temperature and composition ranges of microheterogeneity in the phase diagram of the Fe-Cu system. The nonuniform Fe and Cu distributions have been accounted for in the quasi-chemical approximation of the theory of irregular solutions, which has been used to evaluate the short-range order parameter and integral enthalpy of mixing

Abstract-Nanoindentation is used to measure Young's modulus, the hardness, the plasticity, and the yield strength of the phases in Al-50 wt % Sn alloy samples prepared by a traditional method and using liquid state homogenization. The effect of an increase in the cooling rate by an order of magnitude and alloying with 0.06 wt % Ti or 1 wt % Zr on the mechanical properties of the phases in the Al-50 wt % Sn alloy is studied. The most substantial effect on Young's modulus of the phases in the Al-50 wt % Sn alloy is found to be exerted by the homogenization of the metallic liquid and the introduction of zirconium in the alloy melt: the metal forming of an ingot is improved substantially.

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The effect of liquid-phase treatment of Al -27 wt.% Cu -6 wt.% Si melt used for making A34 solder on the structure and phase composition of crystallized specimens is studied. Pioneer data are obtained on the changes in the microstructure of the alloy due to its direct heating on the specimen stage of an NTEGRA Therma scanning probe microscope at 150 and 300°C.