Effects of Additional Elements on the Grain Boundary Reaction in Cu-2%Be Alloy

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  • Cu-2%Be合金の粒界反応型析出におよぼす添加元素の影響
  • Cu 2パーセント Be ゴウキン ノ リュウカイ ハンノウガタ セキシュツ

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Abstract

The effects of the addition of 0.1∼0.5 wt% of Ti, and 0.3 wt% of Co, Ni, Fe, Cd, Zn, Al, In, Mn, Cr or Si on the grain boundary reaction in Cu-2 wt%Be alloy on aging at 523 or 623 K after quenching from 1093 K were investigated simultaneously with the effects of these elements on the intragranular precipitation of γ′ phase by the quantitative metallographic method. Moreover, the effects of these elements on the grain growth of Cu-2%Be alloy at the solution treatment temperature where γ′ phase could not precipitate were examined in connection with the effects of these elements on the grain boundary reaction at aging temperature, and the mechanism that these elements suppressed the grain boundary reaction was proposed. The results obtained are as follows:<BR>(1) In Cu-2%Be alloy, the nodule increased rapidly along with the hardening due to the precipitation of γ′ phase in the matrix and engulfed the matrix entirely. It is considered that the increase of the lattice strain in the matrix due to the precipitation of the γ′ phase also acts as a driving force for the nodule growth in this alloy.<BR>(2) In the case of the addition of 0.1∼0.5 wt%Ti, the degree of the effect that this element suppressed the nodule growth in Cu-2%Be alloy increased with increase of the amount of addition. The addition of 0.3%Ti suppressed the nodule growth in nearly the same degree as the addition of 0.3% of Co or Ni. The addition of 0.5%Ti showed remarkable effect and almost entirely suppressed the nodule growth.<BR>(3) The addition of In, Ni, Fe hastened the precipitation of γ′ phase in the matrix, on the other hand, the addition of Co, Mn, Cr, Ti delayed the precipitation of the γ′ phase. The elements which suppressed remarkably the nodule growth were In, Cd, Ni, Fe, Co, Mn and Ti. Therefore, it became clear that all the elements which were effective against the grain boundary reaction did not necessarily act to hasten the precipitation of the γ′ phase.<BR>(4) The obvious quantitative correlations were found out between the effect of these elements on the grain growth in Cu-2%Be alloy at 1093 K and the effect of these elements on the nodule growth at the aging temperature of 523 or 623 K.<BR>(5) It is considered from above facts that the mechanism that the nodule growth in Cu-2%Be alloy is suppressed by these additional elements is similar to the mechanism that the grain growth of this alloy at 1093 K is suppressed by these elements.

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