Cu-SnとCu-Zn 2元合金の柱状晶のデンドライト組織

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タイトル別名
  • The Structure of Columnar Dendrite in Cu-Sn and Cu-Zn Alloys
  • Cu-Sn ト Cu-Zn2ゲン ゴウキン ノ チュウジョウショウ ノ デンドライト ソシキ

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説明

The structure of columnar dendrite, especially the dendrite element size and the dendrite arm spacing, have been investigated in Cu-Sn and Cu-Zn alloys.<BR>In Cu-Zn alloys the dendrite element size is uniform everywhere on a given transverse section of columnar crystals, while in Cu-Sn alloys fine dendrite elements appear in group together with coarse dendrite elements on the transverse section. The fine elements are continuous as a bundle along the growth direction of columnar crystals and the average concentration of tin in the region of fine elements is similar to that of the other region.<BR>The dendrite element size is inversely proportional to 0.3∼0.5 power of the cooling rate in the solid-liquid coexisting region, Vs, and the dendrite arm spacing is inversely proportional to 0.1∼0.3 power of Vs. At a given cooling rate, the dendrite element size is roughly proportional to the square root of the solute content for Cu-Zn alloys and is proportional to the solute content for Cu-Sn alloys. The dendrite arm spacing in Cu-Sn alloys is constant at about 10 wt%Sn or less and decreases with increasing solute content at about 10 wt%Sn or more.<BR>From these results, it is concluded that the factors governing the columnar dendrite structure in Cu-base binary alloys are similar to those in Al-base alloys.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 35 (2), 107-112, 1971

    公益社団法人 日本金属学会

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