Studying the Viscosity of Liquid Aluminum–Nickel Alloys

Temperature and concentration dependences of the viscosity of melts of the Al–Ni system are obtained experimentally in a wide range of temperatures (from liquidus to 1700°С) and concentrations (nickel content, 0 to 100 at %). The temperature dependences of the viscosity obtained in the heating and cooling modes coincide, and there is no hysteresis. Viscosity isotherms have a nonmonotonic form with maximum values at nickel contents of 50–65 at % and a minimum at 85 at %. The nonmonotonic viscosity isotherms of liquid alloys are explained by a change in the type of short-range ordering in a melt upon a change in concentration.