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中文摘要：
对Cu-7．9％Co包晶合金不同定向凝固速率下的凝固组织进行了研究。结果表明：在定向凝固速率1μm／s～100μm／s下，随凝固速率的提高，初生α-Co相体积分数减少，使形态从定向生长的枝晶转变为等轴枝晶，相应地β-Cu包晶相的生长界面形态由平界面转变为枝状界面。利用最高界面生长温度假设，计算得到了凝固速率在0．55μm／s～5000μm／s范围内α-Co相领先于β-Cu相生长，与实验结果较为吻合；并当凝固速率大于5000μm／s时，β-Cu相的凝固界面生长温度高于α-Co而成为领先相，可以不通过包晶反应直接从熔体中凝固析出。
英文摘要：
Directionally solidified microstructures of Cu-7.9%Co peritectic alloy have bee investigated at the growth rate ranging from 1 μm/s to 100μm/s. The results show that the morphology of α-Co primary phase changes from a columnar dendrite to an equiaxed dendrite and its volume fraction decreases with increasing of growth rate. Simultaneously, the interface morphology of β-Cu peritectic phase becomes unstable from planar to dendritic interface. The theoretical analysis results indicate that α-Co phase can grow ahead of β-Cu phase as the growth rate ranges from 0.55μm/s to 5000μm/s, which is in agreement with the experimental results. In addition, when the growth rate is more than 5000 μm/s, β-Cu phase can grow as the primary phase and directly solidifies from the liquid metal without peritectic reaction.
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