抄録
The effects of cold-work and subsequent annealing on the rigidity of pure silver wire are measured by means of a torsion pendulum. Pieces of silver wires (purity 99.500) of 1 mm in diameter are cold-rolled and cold-twisted to various degrees and heated at a constant rising rate of 1.7°C/min from a room temperature (20°C) up to 520°C in a vertical furnance.
(1) There is a remarkable difference between the temperature change of rigidity of cold-rolled specimens and that of cold-twisted specimens. For cold-rolled specimens, the rigidity-temperature curve shows anomalous changes in the temperature ranges θ1_??_θ2 and θ3_??_θ4. The former change may be due to the re-arrangement and annihilation of free dislocations, and the latter may correspond to re-crystallization. For cold-twisted specimens the former change is not obvious.
(2) The rigidity-temperature curve of unworked or annealed specimen decreases almost linearly at first as the temperature rises, but above a certain temperature it becomes concave to the temperature axis.
