銅―すず合金のデンドライト組織形態と逆偏析との関係

抄録

  It was already predicted in the preceeding papers by the present authors that the factors governing inverse segregation in the Cu-Sn alloy were the interdendritic flow of solute-rich liquid and the solute concentration in the liquid which depend on the dendrite morphology. This paper describes the dependence of dendrite morphology on inverse segregation. The Cu-8%Sn alloys containing small amounts of Al, Si, P, Ni or Fe to alter dendrite morphology were solidified unidirectionally or free-directionally under controlled conditions.
  The alloys containing Al and Si have elongated arms of primary dendrites, while ones containing Ni and Fe have shortened arms. The inverse segregation is accelerated in the former and relieved in the latter. The inverse segregation strongly depends on the dendrite morphology.