Young's Modulus as a Function of Wire Diameter

Abstract

IT was observed that, during annealing, the modulus of elasticity of copper wires may be appreciably lowered¹. This phenomenon has been explained by Barrett² as resulting from alterations in their textures. As has been shown by Schmid and Wassermann³, most metals with a face-centred cubic structure such as copper, silver or gold exhibit a double fibre structure when cold drawn. This double texture consists of crystals the [111] or [100] directions of which are parallel to the axis of the wire. In copper, for example, 40 per cent of the grains are oriented in the [100] and 60 per cent in the [111] direction. Body-centred cubic metal wire, such as iron, tungsten and molybdenum, was found to have a simple [110] texture^4,5.