The Hot Working Characteristics of Eutectic-Rod-Stabilized Conductor Alloys

AbstractRecrystallized, rolled rods of two Al conductor alloys were deformed in torsion between 200 and 500°C and 0.02 and 5.0 s−1. The flow stresses were found to depend on the strain rate through a sinh function with exponents of 3.1 and 3.5 and on temperature through an Arrhenius term with activation energies of about 260 kJ mol−1, much greater than for Al. Flow stresses increased with rising eutectic content and were considerably higher than commercial Al at 300 and 200°C, consistent with their resistance to creep softening in that range and resulting in considerable adiabatic heating at the higher strain rates. The strengthening depends upon the dispersion of the eutectic rods which were refined by continuous wheel casting, were fractured and dispersed by rolling, and have very low solubility. Resume Des tiges laminees et recrystallisees de deux alliages d’Al conducteurs ont ete deformees en torsion entre 200 et 500°C a des taux de deformation compris entre 0,02 et 5 s−1. Les contraintes d’ecoulement...