抄録
Changes in electric resistance with varying temperatures were investigated on some thirty alloys of the α-solid solution of Ni-Cu-Zn system. An anomaly was observed at the temperatures between 300° and 450° with varying composition of alloys. This anomaly appears especially remarkable at compositions where Ni and Zn have same ratio; except in the copper-rich alloys.
Mean temperature coefficients of electric resistance between 20° and 100° of these ternary alloys with the same content of Cu generally increase with increasing content of Zn, except an irregularity at a probable composition haying same quantity of Ni and Zn, in which abnormally high temperature coefficient is observed.
As shown by the broken lines in the resistance _??_temperature curves of some cold-drawn wires of these alloys, we may anticipate the incomprehensible decrease of specific resistance, when these alloys were cold drawn, to be in close connection with the high temperature anomaly.
Besides these experiments, differential thermal analysis and differential dilatation measurements were carried out of an annealed alloy having remarkable high temperature anomaly. Heat evolution on the cooling curve and anomalous expansion on the heating curve, with Cu as neutral, were observed at the temperatures corresponding to the anomalous change in resistance. Further investigation on the cause of this anomaly is now going on.
