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依据定向凝固初始过渡区的溶质分布,探讨了Cu-1.0wt%Cr合金凝固界面形态对组织形成的影响。研究表明:亚共晶Cu-1.0wt%Cr合金初始非稳态定向凝固过程经历了平面状初生α相、完全(α+β)共晶组织以及枝晶状α相和共晶的混合组织的三个演变阶段。随着凝固速度的增加,初始过渡区内单相α的凝固长度减小;初始凝固平界面易在初始过渡区的单相α生长阶段发生失稳,并导致完全(α+β)共晶组织的凝固过程不会发生。理论分析得到的初始过渡区平界面失稳及组织演变的规律,与实验结果相吻合。
According to the solute distribution in the initial transition zone of directional solidification, the influence of the morphology of Cu-1.0wt% Cr alloy on the microstructure was discussed. The results show that the initial unsteady solidification process of the hypoeutectic Cu-1.0wt% Cr alloy undergoes the planar primary α phase, the complete (α + β) eutectic structure and the dendritic α phase and eutectic mixed structure Three evolution stages. With the increase of the solidification rate, the solidification length of the single phase α in the initial transition zone decreases. The initial solidification interface tends to instability in the single phase α growth of the initial transition zone and leads to the complete (α + β) eutectic structure The solidification process will not happen. Theoretical analysis of the initial transition area of the plane interface instability and the evolution of the law, consistent with the experimental results.