Method of manufacturing a micro-alloy high purity aluminum conductor for use at ultra low temperature

A method of manufacturing an aluminum alloy conductor for use at ultra low temperature, wherein the method consists essentially of the steps of

• adding at least one of the metallic and semimetallic effective elements selected from the group consisting of B, Ca, Ce, Ga, Y, Yb and Th, in a total amount of 6 to 200 weight ppm, into a previously prepared molten high purity aluminum having a purity of not less than 99.98 wt % to thereby obtain a molten metal mixture;
• casting the molten metal mixture to thereby obtain a casting;
• subjecting the casting to a homogenization treatment at 450.degree. C. to 650.degree. C. for ten minutes to twenty hours to thereby obtain a homgenized product;
• subjecting the homogenized product to extrusion working at 150.degree. C. to 350.degree. C. in an area reduction ratio of 1:10 to 1:150 to thereby obtain a worked product;
• and
• annealing the extrusion worked product at a temperature of 250.degree. C. to 530.degree. C. for 3 to 120 minutes, whereby an aluminum alloy conductor for use at ultra low temperature is obtained.

A method of manufacturing a cryostatic stabilizer capable of being used at ultra low temperature, wherein the method consists essentially of the steps of:

• adding at least one of the metallic and semimetallic effective elements selected from the group consisting of B, Ca, Ce, Ga, Y, Yb and Th, in a total amount of 6 to 200 weight ppm, into a previously prepared molten high purity aluminum having a purity of not less than 99.98 wt % to thereby obtain a molten metal mixture;
• casting the molten metal mixture to thereby obtain a casting;
• subjecting the casting to a homogenization treatment at a temperature of 450.degree. C. to 650.degree. C. for ten minutes to twenty hours to thereby obtain a homogenized product;
• subjecting the homogenized product to extrusion working at 150.degree. C. to 350.degree. C. in an area reduction ratio of 1:10 to 1:150 to thereby obtain an extrusion worked product;
• annealing the extrusion worked product at a temperature of of 250.degree. C. to 530.degree. C. for 3 to 120 minutes to thereby obtain an annealed product;
• and
• providing a superconductor and providing the annealed product on and around said superconductor.