日本金属学会誌

J. Japan Inst. Metals, Vol. 29, No. 8 (1965),
pp. 778-781

Annealing Effect of the Cu-15 at%Al α Solid Solution

Shozo Yoshioka1, Yutaka Nakayama1 and Taichiro Ito2

1College of Engineering, University of Osaka Prefecture, Sakai
2Postgraduate Students, Research Dirision in Engineering University of Osaka Prefecture, Sakai

Abstract:

The distribution and arrangement of dislocations of Cu-15 at%Al single crystals deformed after various heat treatments were investigated by means of transmission electron microscopy. As the function of annealing temperature, stacking fault energies were determined from the radii of curvatures of extended dislocation nodes with polycrystals and also the yield drops, Δ τ , with single crystals were measured. The results obtained are as follows:
(1) The distribution and arrangement of dislocations in the specimen deformed immediately after quenching from 800°C were considerably in order and the distance between the neighboring dislocations in a dislocation array was almost constant. Whereas in those deformed after annealing at 250°C, dislocation pairs and coplanar dislocations were observed.
(2) The yield drop Δ τ , at room temperature increased as the annealing temperature increased, reaching a maximum at 250°C for 10 hrs annealing. By annealing over 250°C, Δ τ decreased as the annealing temperature increased.
(3) The stacking fault energy showed the same behavior for the annealing temperature as in the case of Δ τ .


(Received 1965/1/29)

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