<総説>70-30黄銅の温度673Kにおける破断伸びと変形組織の関係

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For a further understanding of high temperature tensile-deformation behaviorof a Cu-30 mass% Zn binary alloy depending on the strain rate, the structureand the stress-strain curves were investigated in detail, at 673K, using a saltbath (NaNO,: KN03 = 1: 1) under a strain rate range from 3.3x 10- 5 to 2.0x1O- 1s- 1• Specimens with three grain sizes ranging from 0.012 to 0.045 mm diameterwere used. When dynamic recrystallization occurred at 673 K, the stressdecreased. After the initial grain shape changed to dynamic recrystallization,the stress-strain curves showed a steady state, and did not depend on the occurrenceor the growth of voids. The peak strain, which is the strain at maximumstress, was hardly dependent on the size of the initial grain, but dependent onthe strain rate. Thus, the peak strain increases with strain rate. At this time,the dynamic recrystallization form is a bulging mechanism and simultaneously,a nucleation mechanism. This occurrence happened at about 20-30% peakstrain. Initial void formation depended on the strain rate. And the strainappearing void increased with increased in strain rate. Cavities of fracturedspecimens showed 4 different shapes in three dimensions which corresponded toinitial grain size and strain rate. Fractured elongation reveals a tendency tobecome smaller, when cavities start to combine and grow into a45degree anglein relate to the tensile direction. On the other hand, the specimens exhibit largeelongation, when cavi ties combine and grow in the tensile direction.

<総説>70-30黄銅の温度673Kにおける破断伸びと変形組織の関係

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