チョクラルスキー法によるCu-Ge包晶合金結晶の育成条件

概要

論文の詳細を見る
The condition to grow the peritectic crystal of copper-germanium alloy by the Czochralski method is discussed based upon the known theories on the distribution of solute near the solid liquid interface and the onset of constitutional supercooling during crystal growth from the stirred melt. It is proposed that the alloy crystal should be pulled at a controlled rate from a hyperperitectic melt. The pulling rate has to be higher than a minimum rate which is necessary for the steady growth of the peritectic crystal but needs to be lower than a maximum rate given by a critical rate resulting in constitutional supercooling at the same time. Pullings of the copper-germanium alloy rods were carried out under the predicted condition. It is shown that the investigation of the microstructures of the peritectic ξ phase which were formed in the pulled rods supports the above discussion.
秋田大学の論文