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通过定向凝固实验,研究Cu-Ge合金中的包晶反应过程。大的包晶反应三相区被用于研究包晶反应期间三相区界面的稳定性。在不同的生长条件和成分下,三相区呈现不同的生长形态。在Cu-13.5%Ge亚包晶合金中,随着抽拉速率从2μm/s提高到5μm/s,观察到了包晶相界面的失稳现象,而此时初生相的熔化界面相对稳定。但在Cu-15.6%Ge过包晶合金中,当抽拉速率达到5μm/s时,初生相重熔界面呈现非平面形态。基于成分过冷理论,分析初生相重熔界面和包晶相凝固界面的形态稳定性。
Through the directional solidification experiment, the peritectic reaction in Cu-Ge alloy was studied. The large peritectic reaction three-phase zone was used to study the stability of the three-phase zone interface during the peritectic reaction. Under different growth conditions and components, the three-phase region showed different growth patterns. In the Cu-13.5% Ge sub-peritectic alloy, the instability of the peritectic phase interface was observed as the drawing rate increased from 2μm / s to 5μm / s, while the melting interface of the primary phase was relatively stable. However, in the Cu-15.6% Ge peritectic alloy, when the drawing rate reaches 5μm / s, the interface of primary phase refolding presents a non-planar morphology. Based on the theory of component undercooling, the morphological stability of the interface between the primary phase and the peritectic phase was analyzed.