Ultrapure aluminium conductor at extremely low temperature

摘要

The aluminium conductor increases little in the electrical resistance at extremely low temperature of 30 DEG K or below, even after a cyclic deformation at an extremely low temperature, by such a control of the crystal structure of the ultrapure aluminium conductor having a purity of 99.9 to 99.9999% by weight that it consists of (i) a pure monocrystal or a virtually pure monocrystal which consists of a bundle of subgrains whose crystal axes lie in the same direction or as a whole in the directions within several degrees of deviation and which has a specific crystal axis of <111> or <100> or crystal axes which lie in the vicinity in the longitudinal direction of the aluminium conductor, or (ii) a polycrystal where most of the grains have corresponding specific crystal axes of <111> and/or <100> or crystal axes which in relation to each grain are close together in the longitudinal direction of the aluminium conductor and have a specific particle size of 0.01 mm to 3.0 mm.