銅-ベリリウム系合金の冷間加工と時効特性

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  • Aging Characteristics of Some Copper-Beryllium Alloys in Relation to Cold-Working Prior to Aging Treatment
  • ドウ-ベリリウムケイ ゴウキン ノ レイカン カコウ ト ジコウ トクセイ

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The effect of cold-working (cold-rolling of 30 and 80% in reduction) prior to aging treatment on the aging characteristics of some copper-beryllium alloys was investigated. The experiments were carried out on the binary alloys containing 0.7 and 1.8 wt% beryllium, respectively as well as on the ternary alloys containing additionally 0.3% cobalt. In the aging of cold-worked specimens, it was hardly possible to discriminate the effect of cold working on the aging process from the change in hardness and electrical resistance, because of the simultaneous occurence of recovery, over-aging or recrystallization. However, the change in Young’s modulus showed that the cold-working accelerated the aging process in both low-and high-temperature ranges. Differences in aging characteristics due to the alloy composition and the degree of cold-working were also discussed in relation to the results of microscopic observations.

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