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] texture4,5.