日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 4 (1957),
pp. 217-221

The Effects of Cold-Drawing and Annealing on the Rigidity Modulus in Phosphor Bronze and Nickel Silver

Hideo Takei


Abstract:

In this paper, the changes of the rigidity modulus, the electrical resistivity and the hardness due to cold-drawing and annealing were measured for phosphor bronze and nikel-silver wires which are used as spring materials. The measurements were made by the use of a torsion pendulum, a potentiometer and a Micro-Vicker's hardness tester. The results obtained are as follows: (1) The rigidity modulus of phosphor bronze increases with the amount of cold-drawing to the reduction of area less than 45%, and is almost constant at 45∼70% reduction,but,gradually decreases by the heavy drawing above 80% reduction. The electrical resistivity and the hardness rise linealy with the reduction in area. (2) The rigidity modulus of nickel-silver decreases remarkably with the amount of cold drawing up to 80% reduction. The electrical resistivity also rises remarkably with the reduction of area, though a small increase in resistivity was found at the early stage of drawing. (3) Though the rigidity modulus of the phosphor bronze wire of 91% reduction slightly increases by annealing at 150∼250°, a remarkable increase of rigidity, which seems to be the result of recrystallization, takes place at the annealing temperature between 250∼350°. The maximum value of the rigidity modulus was obtained by annealing at 350°. (4) In case of nickel-silver wire of 91% reduction, the rigidity modulus increases with the annealing temperature above 150°, and at 450∼500°, in which recrystallization takes place, the increase becomes remarkable. The maximum value of rigidity modulus was obtained at 500°.


(Received 1956/10/29)

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