銅線の剛性率の冷間加工及び焼鈍による変化について (4)

抄録

Continued from the preceding experiment, the effects of cold-work and low temperature annealing on the rigidity of copper wire are observed by the method of torsion pendulum. Torsion has been used as the means of deformation, and specimens are heated continuously with a constant rate of 1.7°C/min from a room temperature to 400°C. The rigidity is measured at various temperatures within the above range of temperature.
Fig. 2 and 3 show the results of the measurement, and Fig. 7 shows the relation between Δt/T_ann and the heating temperature. From these measurements and metallographic examinations, the following are found.
(1) For all specimens, the rigidity increases gradually at first with the rise of heating temperature.
(2) However, it becomes somewhat constant above a temperature θ'₁.
(3) Above a temperature θ'₂ the rigidity begins to increase very rapidly at which the specimens recrystallize.