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Investigation of Microstructure Evolution and Phase Selection of Peritectic Cuce Alloy During High-Temperature Gradient Directional Solidification

机译:高温梯度定向凝固过程中包晶型包晶合金的组织演变及相选择的研究

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摘要

In this work, a CuCe alloy was prepared using a directional solidification method at a series of withdrawal rates of 100, 25, 10, 8, and 5 μm/s. We found that the primary phase microstructure transforms from cellular crystals to cellular peritectic coupled growth and eventually, changes into dendrites as the withdrawal rate increases. The phase constituents in the directionally solidified samples were confirmed to be Cu Ce, CuCe, and CuCe + Ce eutectics. The primary dendrite spacing was significantly refined with an increasing withdrawal rate, resulting in higher compressive strength and strain. Moreover, the cellular peritectic coupled growth at 10 μm/s further strengthened the alloy, with its compressive property reaching the maximum value of 266 MPa. Directional solidification was proven to be an impactful method to enhance the mechanical properties and produce well-aligned in situ composites in peritectic systems.
机译:在这项工作中,使用定向凝固方法以一系列的撤回速率分别为100、25、10、8和5μm/ s制备CuCe合金。我们发现初级相的微观结构从细胞晶体转变为细胞包晶的耦合生长,并最终随着撤离速率的增加而转变为树枝状晶体。证实了定向凝固样品中的相成分是Cu Ce,CuCe和CuCe + Ce共晶。初生枝晶的间距随着退出速率的增加而显着细化,从而导致更高的抗压强度和应变。此外,以10μm/ s的孔包晶层耦合生长进一步增强了合金,其压缩性能达到了266 MPa的最大值。定向凝固被证明是一种有效的方法,可以提高包晶体系中的机械性能并生产出排列良好的原位复合材料。

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