Continued from the preceding experiment, the effects of cold-work and annealing on the rigidity of copper wire are observed by the method of torsion pendulum. This time, cold-twisted copper wires are employed as the specimens.
The results obtained are as follows. (Fig. 1). (1). From a certain annealing temperature T
1', the rigidity becomes almost constant. (2). From another temperature T
2', the rigidity decreases very rapidly. (3). The temperatures T
1', T
2' shift upward with the decrease of the degree of cold-work assigned to the specimens.
From the above and previous results, the cause of the increase of rigidity of cold-drawn copper wire by low temperature annealing is discussed.
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