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| 大尺寸(CrCoNi)94Al3Ti3中熵合金凝固行为 |
| Solidification Behavior of (CrCoNi)94Al3Ti3 Medium Entropy Alloy with Large Size |
| Received:August 17, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.10.007 |
| 中文关键词: 中熵合金 悬浮熔炼 凝固行为 组织演变 |
| 英文关键词: medium entropy alloy levitation melting solidification behavior microstructure evolution |
| 基金项目:国家自然科学基金(52001262，52071188，52171120) |
| Author Name | Affiliation | | LU Jie-bo | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China | | WU Bo | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China | | MA Teng-fei | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China | | WANG Xiao-hong | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China | | LI Ao | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China | | DONG Duo | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China | | ZHU Dong-dong | Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Zhejiang Quzhou 324000, China |
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| 中文摘要: |
| 目的 制备大尺寸(CrCoNi)94Al3Ti3中熵合金(MEAs)，并研究其凝固行为。方法 利用水冷铜坩埚悬浮熔炼技术制备大尺寸铸锭，通过金相(OM)、扫描电子显微镜(SEM)、能谱(EDS)等手段表征合金不同半径处的凝固组织和偏析行为，并采用Jmpro数值模拟软件预测合金可能存在的相，揭示大尺寸(CrCoNi)94Al3Ti3 MEA的凝固特点。结果 大尺寸(CrCoNi)94Al3Ti3 MEA的凝固组织为典型柱状树枝晶，随着冷却速率的变化，柱状晶形态和尺寸发生了明显变化。在凝固过程中，Ni、Al、Ti元素表现为枝晶间偏析，随着冷却速率的降低，偏析程度逐渐增大。(CrCoNi)94Al3Ti3基体为面心立方结构(FCC)，在枝晶间(ID)存在少量块状的η相金属间化合物(Ni,Co)3(Al,Ti)，同时在ID区域形成了大量不同纳米尺寸的L12相。结合相图可知，大尺寸(CrCoNi)94Al3Ti3 MEA的凝固路径为L→L+γ→L+γ+η→γ+η→γ+γ¢+η。结论 水冷铜坩埚悬浮熔炼技术制备的大尺寸(CrCoNi)94Al3Ti3 MEA无宏观偏析，该技术可以作为工程应用手段。 |
| 英文摘要: |
| The work aims to prepare large-sized (CrCoNi)94Al3Ti3 medium entropy alloy (MEAs) and study its solidification behavior. Large-sized ingots were prepared by water-cooled copper crucible levitation melting. Solidification structure and segregation behavior of alloys at different radii were analyzed with an optical microscope (OM), a scanning electron microscopy (SEM) and an energy dispersive spectroscopy (EDS). The possible phase of alloy was predicted with Jmpro numerical simulation software to reveal the solidification characteristics of large-sized (CrCoNi)94Al3Ti3 MEA. The solidification structure of the large-sized (CrCoNi)94Al3Ti3 MEA was typical columnar dendritic structure. The morphology and size of columnar crystals changed significantly with cooling rate. During the solidification, Ni, Al, and Ti elements exhibited interdendritic segregation, and the degree of segregation gradually increased with the decrease of cooling rate. The (CrCoNi)94Al3Ti3 MEA matrix was a face centered cubic structure (FCC). There were a small number of blocky η phase intermetallic compounds (Ni,Co)3(Al,Ti) in the dendrites (ID). Moreover, a large number of L12 nano-phases was observed in the ID area. The solidification path of (CrCoNi)94Al3Ti3 MEA was L→L+γ→L+γ+η→γ+η→γ+γ¢+η according to phase diagram calculation and microstructure evolution. The large-sized (CrCoNi)94Al3Ti3 MEA prepared with the water-cooled copper crucible suspension melting technology has no macroscopic segregation, which could be used for engineering application. |
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