Co-V-Zr 系统等温截面和液面投影的实验测定

Jiaxing Sun, Cuiping Guo, Changrong Li, Zhenmin Du
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摘要

根据凝固微观结构和相成分分析,构建了 Co-V-Zr 三元体系的实验液面投影和等温截面。在 1100 ℃ 和 1000 ℃ 时,发现了一种新的 Cr0.5Fe1.5Zr 型化合物 τ,τ 中 Zr 的测量成分范围分别为 ∼ 28.6 至 57.3 % pct 和 32.9 至 56.8 % pct。液面投影确定了九个主要凝固区域,而从二元图中推断出两个主要凝固区域。此外,在 1100 °C 和 1000 °C 时分别确定了 8 个和 10 个三相平衡。在 1100 °C时,测得的V在Co23Zr6、Co2Zr和CoZr中的溶解度分别达到~ 0.5、7.6和4.1%。同时,在 1000 ℃ 时,测得 V 在 Co23Zr6、Co2Zr、CoZr 和 CoZr2 中的溶解度分别为约 0.4、7.6、1.6 和 3.6%。在 1100 ℃ 时,锆在 Co2V3 中的溶解度为 ~ 3.6 at. pct,而在 1000 ℃ 时,锆在 Co3V、Co2V3 和 CoV3 中的溶解度分别为 ~ 1.3、3.0 和 4.5 at. pct。这些实验数据有助于改进 Co-V-Zr 系统的热力学参数,并推动多组分 Co 基超合金数据库的开发。
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Experimental Determination of the Isothermal Sections and Liquidus Surface Projection of the Co–V–Zr System

The construction of the experimental liquidus surface projection and isothermal sections of the Co–V–Zr ternary system was based on the analyses of solidification microstructures and phase constituents. A new compound τ with Cr0.5Fe1.5Zr-type was identified, and the measured composition range of Zr in τ was ∼ 28.6 to 57.3 at. pct and 32.9 to 56.8 at. pct at 1100 °C and 1000 °C, respectively. The liquidus surface projection identified nine primary solidification areas, while two primary solidification areas were inferred from binary diagrams. Moreover, eight and ten three-phase equilibria were determined at 1100 °C and 1000 °C, respectively. The measured solubility of V in Co23Zr6, Co2Zr and CoZr reached ~ 0.5, 7.6 and 4.1 at. pct at 1100 °C. Meanwhile, the solubility of V in Co23Zr6, Co2Zr, CoZr and CoZr2 was measured to be ~ 0.4, 7.6, 1.6 and 3.6 at. pct at 1000 °C. The solubility of Zr in Co2V3 was ~ 3.6 at. pct at 1100 °C, while the solubility of Zr in Co3V, Co2V3 and CoV3 was determined ~ 1.3, 3.0 and 4.5 at. pct at 1000 °C, respectively. The experimental data can help improve the thermodynamic parameters of the Co–V–Zr system and advance the development of databases for multi-component Co-based superalloys.

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