日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 2 (1984),
pp. 209-213

Effects of a Small Addition of Transition Elements on the Heat-Resisting and Electrical Properties of Cold-Worked Pure Copper

Hisashi Suzuki1 Motohiro Kanno1 and Takao Maeda2

1Department of Metallurgy and Materials Science, Faculty of Engineering, The University of Tokyo, Tokyo
2Graduate Student, The University of Tokyo, Tokyo

Abstract:

The half-softening temperature (TH) and the electrical resistivity of cold-worked pure copper were studied in relation to the additional amount (up to 1000 mol ppm) of transition elements such as Ti, Zr, Hf, V, Cr, Mn and Fe. The specimens were in vacuum melted, cast, homogenized at 1073 K, quenched and then cold-worked. It was found that TH of each specimen decreased with the additional amount as small as 10--30 mol ppm and that the electrical resistivity of each specimen, in a cold-worked or annealed state, was almost the same as that of pure copper in the range of addition up to about several mol ppm. These results would be caused by the interaction between a certain impurity in pure copper and additives. Further addition increased TH and the electrical resistivity of copper. It was shown that the material with extremely high TH and excellent conductivity was obtainable by a trace addition of Zr or Hf of only about 170 mol ppm.


(Received 1983/06/29)

Keywords:

copper, softening temperature, transition elements, impurity effect, high conductivity, recrystallization


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