The Effects of Additional Elements on Discontinuous Precipitation in Copper-Beryllium Alloys

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  • ベリリウム銅合金の不連続析出におよぼす添加元素の影響
  • ベリリウム ドウ ゴウキン ノ フレンゾク セキシュツ ニ オヨボス テンカ ゲンソ ノ エイキョウ

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The effects of the addition of small amounts of c.p.h. elements on the discontinuous precipitation in Cu-Be and Cu-Be-Co alloys were investigated. The electrical resistivity, micro-vickers hardness and various tensile properties were measured comparing with the results of metallographic examinations during iso-thermal ageing at 350°C and 250°C after quenching from various solution-treatment temperatures. <BR>It was found that the rate and quantity of growth of the discontinuous precipitation at grain boundaries could be estimated from the shape of the curves in which the changes of electrical resistivity of specimens were plotted as a function of ageing time. The addition of Mg, Co or Cd restrained both zone formation and discontinuous precipitation, though the addition of Zn to Cu-Be and Cu-Be-Co alloys accelerated them considerably. When solution-treated at higher temperature, the addition of Fe was also very effective for the retardation. No discontinuous precipitation was found to occur in Cu-Be-Co alloy containing 0.1 at%Mg.

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