The Effect of Cold Work on the Aging Behavior of Cu-Ti Alloys

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  • 加工を施したCu-Ti合金の時効挙動
  • カコウ オ ホドコシタ Cu Ti ゴウキン ノ ジコウ キョドウ

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Abstract

The Effect of cold work on the aging behavior of modulated structure were investigated for Cu-Ti alloys which show a typical modulated structure, by means of electrical resistivity, transmission electron microscopy, and hardness and 0.1% proof stress measurements. We prepared Cu-5 at%Ti supersaturated alloys by rapid cooling, and these alloys were rolled and aged at 623,673 and 723 K.<BR>The results obtained were as follow:<BR>(1) In the short time aging specimens the resistivity of the as-quenched alloy indicated three principal processes on the semilogarithmic plot. In the case of the deformed alloy, however, it was found that the first process disappeared, but the second and third processes continued to exist. The second process is thought to correspond to the predominent constant wavelength range defined in Cahn’s spinodal decomposition theory. The average predominent wavelength was about 4.8 nm upon aging at 673 K. The experimental activation energy for this process was 202.1 kJ/mol for the as-quenched alloys and 99.2 kJ/mol for the deformed alloys and the effect of cold work was initially affected in the aging process.<BR>(2) For a long time aging, the electrical resistivity of the as-quenched and deformed alloys decreased during aging and then became constant. These break points of the resistivity curves corresponded to aging time at the maximum hardness. These break point of the deformed alloys occurred earlier than the as-quench alloys. Eventually, the aging behavior was accelerated by cold work.<BR>(3) The deformed alloys were higher in both maximum hardness and 0.1% proof stress than as-quench alloys. The amount of hardness increased with increasing deformation.

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